Updating Vundle interface

The latest versions had changed the interface signficantly and I hadn't
noticed for a long time.
Including the rbenv completions script in install

Bash started complaining on a new OS X setup and alerted me to the
rather manual way that I'd set this up on my existing machine.
Removing awkward step of symlinking to install dir

Previously a user had to manually symlink their checked out directory to
the hard-coded install directory. Or he could extract it directly to
the hard-coded install directory. This was a very clunky step that was prone to
error.

The code in this commit takes care of the issue.
Including a gitignore file as part of install.

This global file was necessary to make git based workflows easier, in
particular on OS X.
Moving away from local plugins for Vundle

They caused a bunch of issues when I tried to manage them from a
different machine. I should do one of two things for the remaining two
local plugins.
1. Make them git submodules: I'm leaning toward this right now.
2. Create repos on bitbucket and link Vundle to those
https://github.com/gmarik/Vundle.vim/issues/307
Including more flexible setup of user name & email
Give install specific settings a say

There was no real way for me to have installation specific settings
without a mechanism such as the one I've proposed. The gitignored file
includes any custom tweaks to a machine where I have the dot-files.
Set vrapper to copy to system clipboard by default

Got a helpful pointer from the answer here:
http://stackoverflow.com/questions/26415479/how-do-i-copy-from-vrapper-on-eclipse-in-os-x-to-system-clipboard/26419417#26419417

It's also over here:
http://vrapper.sourceforge.net/documentation/?topic=configuration
Add tmux resurrect plugin

I had to add tmux plugin manager and set it up for the tmux resurrect to
work. On a new machine, remember to clone the tmux plugin manager
repository.
Get better vim commenting and fix local plugin

The local plugin I'd previously used for commenting in vim was a hack
and didn't trickle down to the new host where I was using the dot file
setup. It caused all kinds of weird issues that frankly just wasted my
time. Tim Pope's Vim commentary plugin should be a much better long term
solution.
Bring Vundle configuration in line

The directions for installing vundle had changed considerably.
https://github.com/gmarik/Vundle.vim
This seemed to be the cause of the problems I had with my Debian setup.
Fix Vundle installation

I updated vimrc but hadn't updated the install step.
Fixing Vundle upgrade issues

1. Vundle had become more picky about having the end call after all the
plugins had been loaded. Without inserting the end call, the plugins
would just not work.
2. The bufexplorer plugin threw some errors that didn't make sense. I
wasn't using it anyway. So it made sense to remove that plugin
altogether.
3. The local plugins were troubling me constantly and not adding a whole
lot of value in the process. I'm removing them for now.
Add ack.vim plugin
Merge branch 'master' of https://bitbucket.org/gkb6891/dotfiles