Better copy/paste interop for tmux 1.8 and OS X

<prefix> Ctrl-c : copy into system clipboard
<prefix> Ctrl-v : tmux paste from system clipboard

In tmux copy-mode:

v : begin selection (same as "space")
y : yank into both tmux buffer and system clipboard
Merge pull request #13 from rondale-sc/master

Add rmbranch alias to gitconfig
Merge pull request #14 from rondale-sc/master

Fix typo in rmbranch git alias.
Unused steps has moved to "hr"
Remove duplicates from $PATH

In addition fixing the more general case, this specifically fixes the
combination of tmux, zsh, and mux polluting the $PATH
Drop deprecated installation methods

Please use bin/install, bin/upgrade and bin/uninstall
Remove heroku-related commands

These commands have been moved to hr.
Make rails_root more "private"
Remove guard stuff

Guard tends to be too application-specific to attempt to generalize.
Add Super Tab to vimbundles.sh
Fix up hitch completion
Add deprecation warning to hclone

This is moving to hr. It will be easier to test and maintain as a
script.
Tmux conf enhancements

* increase scrollback
* moar mouse controlz
Explicitly use the git command to avoid wrappers
Only load tmux override if it exists
Add snapshot alias to git.