Improved brew completion

Using arg completion
Context-based completion for most of commands (i.e. only installed
packages for upgrade or remove, only outdated for upgrade and so on)
Remove xsel from the build
https://github.com/fish-shell/fish-shell/issues/633
Remove some GNU-makeisms from the Makefile to try to get us to build with BSD make. Not quite there yet.
Merge pull request #630 from vhbit/e02e5e503d9078e9f0ef8942f57f3cf93eb07718

Lein command completion
Squashed commit of the following:

commit 1bbde16b17f04903340206bada9935ea64f785ba
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:12:22 2013 -0500

    fix spelling in xterm.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 392dd59da76e6a1293db79733e1975dbb9ef4032
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:10:08 2013 -0500

    fix spelling in type.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit f82026828e4c08bdf355176f86489783c57efc80
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:09:34 2013 -0500

    fix spelling in top.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 196f2ec59c0904eb13159d1063e2e6c6edbd50a8
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:08:16 2013 -0500

    fix spelling in scrot.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 8400d97dce93afe48612c66eb8ddc2bd06b40968
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:07:48 2013 -0500

    fix spelling in scp.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit b68bb3f36915520d2c271e48e2d5356e087e9fcf
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:04:30 2013 -0500

    fix spelling in mount.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 97000184afde10ca26b6dda8597baa0593bb4e09
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:01:46 2013 -0500

    fix spelling in hg.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 87ca4e71ce57842ab98e4d6b6f9274aafd9713a5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:00:37 2013 -0500

    fix spelling in gzip.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 17246a21ad3df39660e6b4c86bf8c6a2239b416b
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 01:00:07 2013 -0500

    fix spelling in gunzip.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 0f618600508695ed5a93110568343f8a783db8c5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:59:37 2013 -0500

    fix spelling in grep.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit bacf6a62041d13f1766e90748cfc2c76e1b04b98
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:58:16 2013 -0500

    fix spelling in git.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit f8f6a1914a8f2f60a14dac532f1d63dd8269f676
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:56:45 2013 -0500

    fix spelling in fuser.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit dcdfd1552dfd360d1ce808706bc401d52cce22ce
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:54:58 2013 -0500

    fix spelling in effectv.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 7b4388364f546b81f0557c500bb6a5207931c3be
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:53:45 2013 -0500

    fix spelling in du.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 0450070e98adae2ebe19806f4fb74386a50de003
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:52:55 2013 -0500

    fix spelling in df.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 49ae24ae0dbd06c72e6c994f1ea4ca9b385fdda5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:49:00 2013 -0500

    fix spelling in cut.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 4eccc923f389e2fc0c498fc63e4bbeeccc177e9a
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:47:21 2013 -0500

    fix spelling in compare.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 8c0cfb91c596ef7a1583877c8f38fab7e867cff2
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:46:46 2013 -0500

    fix spelling in chown.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 4518b06c3fc8c565038ccbeeb0d2f8aea73e1ee0
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:46:08 2013 -0500

    fix spelling in chgrp.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit a0a4fb3dc271c469482e87a0f9efab4016596f82
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:43:04 2013 -0500

    fix spelling in apt-setup.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 740e75e5316e73fb03c00bd9b482786d1f387cc5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:42:25 2013 -0500

    fix spelling in apt-rdepends.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 7a2727bcb96e58a023d0f8ab807f839e76555375
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:27:27 2013 -0500

    fix spelling in fish_complete_pacman.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 0e28ff4c1c90bdbf1e1b780d0ab3c2ba04b3a463
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:26:17 2013 -0500

    fix spelling in fish_complete_pgrep.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 1ca9fad713c460debcd851dfcffa135f3b579561
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:24:13 2013 -0500

    fix spelling in trap.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit deb0c2129d50d627d720cbd549cf8aadc3113243
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:19:00 2013 -0500

    fix spelling in fish_not_contain_opt.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 8a40bd08b37d5c80041b7beb58fb82d9b0592b5d
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:18:16 2013 -0500

    fix spelling in fish_make_completion.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit f1c48dc8236a8eb5ba0e45e985e8dd7eadfb88e5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:17:09 2013 -0500

    fix spelling in fish_gnu_complete.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit b6813883d9355f8e15917769d46b58cc8fab840d
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:16:33 2013 -0500

    fix spelling in fish_git_prompt.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 97e3e74ddb743061a8e4349bf7895cf98cf9d9b2
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:13:11 2013 -0500

    fix spelling in fish_complete_vi.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 7c31d5fec8f855fbc3496be7200915a1d2dc4d46
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:10:47 2013 -0500

    fix spelling of in fish_complete_tex.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 3f06bdb91942c4d0e686d1bb8b5eff1983a91304
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:06:45 2013 -0500

    fix spelling in fish_complete_list.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 5bfd9ef40547b744c9bbfb4cc6f8a7d880d8f3d6
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Mon Apr 1 00:03:14 2013 -0500

    fix spelling in fish_complete_atool.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit b84a43ff0bad5e206a591891b6c7ff9028e14eb5
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Sun Mar 31 23:40:28 2013 -0500

    fix spelling of protocol in fish_complete_ssh.fish

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Fix a few more spelling / grammar issues in functions and completions
Replace a formatted string with just a character copy
Add callbacks that get invoked before the next call to select(), which will allow for a nice fix to https://github.com/fish-shell/fish-shell/issues/608. Eliminate the poll handler, and replace it with this mechanism.
Use the new input_common_add_callback mechanism to not execute callbacks while signals are blocked. Should fix https://github.com/fish-shell/fish-shell/issues/608
Try to fix printf tests on Linux
Another attempt to fix the printf tests on 32 bit Linux
Fix a sign warning
the host keyword in ssh/.config is case insensitive

Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Ignore hashed host names in ssh/known_hosts

Valid DNS names cannot have a | character and hashed ssh hosts
always begin with the | character. Therefore we ignore lines that
begin with |.

Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Some spaces to tabs in __fish_print_hostnames
Repaint after completions
Fixes #643, #644
Fix %s format specifier for printf. No more elpfor at login.
Teach git completion about difftool. Change __fish_git_ranges to output branches as designed.
Improved brew completion

Using arg completion
Context-based completion for most of commands (i.e. only installed
packages for upgrade or remove, only outdated for upgrade and so on)
Squashed commit of the following:

commit 6259665e972d478f1ce4ab3d233033ec1dd7eef2
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Thu Apr 4 11:02:35 2013 -0500

    change spaces to tabs

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 465333d982db441f430767b645fdcd95e44cc5d6
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Wed Apr 3 11:15:22 2013 -0500

    tmux: implement completion for panes

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 684baf98a6ac070847f20a02838abe58e8c22d5b
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Tue Apr 2 23:56:27 2013 -0500

    tmux: don't suggest dirs

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 8c4a9854a1f173866439f976301b743354c945c8
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Tue Apr 2 21:57:40 2013 -0500

    move front flags to the top of the tmux file

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit 7f2321e9cd20a5aa2bcbfe940e20ec57bcca2609
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Tue Apr 2 20:06:54 2013 -0500

    fix some of the initial parameters

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit f70fc55bed40c0ccd2a00921c0e7373e7c18b5d7
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Tue Apr 2 21:47:25 2013 -0500

    implement tmux KEY BINDINGS

    implement the commands in the KEY BINDINGS man page section

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>

commit ec423040dba742f67c06dbb932417f6d19b90fba
Author: Greg Dietsche <Gregory.Dietsche@cuw.edu>
Date:   Tue Apr 2 00:10:43 2013 -0500

    implement tmux completion for CLIENTS AND SESSIONS

    Fully implement all tmux commands found in the tmux man
    page section titled: "CLIENTS AND SESSIONS"

    Signed-off-by: Greg Dietsche <Gregory.Dietsche@cuw.edu>