Increase tmux scrollback lines
Add a config line required by vundle
Use `color.ui = auto` setting to color git output
Use bundler.vim

Includes features such as:

* `:Bundle`, which wraps `bundle`.
* An internalized version of `bundle open`: `:Bopen` (and `:Bsplit`,
  `:Btabedit`, etc.).
* `'path'` and `'tags'` are automatically altered to include all gems
  from your bundle.  (Generate those tags with
  [gem-ctags](https://github.com/tpope/gem-ctags)!)
* Highlight Bundler keywords in `Gemfile`.
* Support for `gf` in `Gemfile.lock`, plus syntax highlighting that
  distinguishes between installed and missing gems.
Remove --noheading flag from ag execution

The flag isn't needed, and seems to cause strange output.

Output with flag in vim:

app/models/group.rb|4| validates :yammer_group_id, :name, presence: true
||·
app/models/event.rb|24| validates :name, presence: ...

---

Output without:

app/models/event.rb|24| validates :name, presence: ...
app/models/event.rb|25| validates :name, length: ...
app/models/event.rb|26| validates :open, inclusion: ...
Add personal preferences
Remove my user specific configs from `gitignore`
Don't treat any of the plugins as submodules