Move Bundles into a separate file

I've had this in [my own dotfiles] for a while now, and really like
having the separation of what I consider to be code/configuration from
what to me feels more like a Gemfile, in that it lists out all of the
external dependencies in a single place.

[my own dotfiles](https://github.com/calebthompson/dotfiles/blob/master/vim/vimrc.bundles.symlink)

* Awesomer vundle integration:
  * Refactor .vimrc and .vimrc.bundles to support standalone
    BundleInstall.
  * Install vim bundles as part of install.sh without sourcing the
    normal vimrc, which prevents error messages from uninstalled
    plugins referenced in the main vimrc.

install.sh

@@ -35,4 +35,4 @@ for name in *; do
 done
 
 git clone https://github.com/gmarik/vundle.git ~/.vim/bundle/vundle
-vim +BundleInstall +qa
+vim -u ~/.vimrc.bundles +BundleInstall +qa

vimrc

@@ -17,36 +17,9 @@ if (&t_Co > 2 || has("gui_running")) && !exists("syntax_on")
   syntax on
 endif
 
-" Declare bundles are handled via Vundle
-filetype off " required!
-set rtp+=~/.vim/bundle/vundle/
-call vundle#rc()
-
-" Let Vundle manage Vundle
-Bundle 'gmarik/vundle'
-
-" Define bundles via Github repos
-Bundle 'croaky/vim-colors-github'
-Bundle 'danro/rename.vim'
-Bundle 'kchmck/vim-coffee-script'
-Bundle 'kien/ctrlp.vim'
-Bundle 'nanki/treetop.vim'
-Bundle 'thoughtbot/vim-rspec'
-Bundle 'timcharper/textile.vim'
-Bundle 'tpope/vim-bundler'
-Bundle 'tpope/vim-cucumber'
-Bundle 'tpope/vim-endwise'
-Bundle 'tpope/vim-fugitive'
-Bundle 'tpope/vim-haml'
-Bundle 'tpope/vim-markdown'
-Bundle 'tpope/vim-rails'
-Bundle 'tpope/vim-surround'
-Bundle 'tsaleh/vim-matchit'
-Bundle 'vim-ruby/vim-ruby'
-Bundle 'vim-scripts/ctags.vim'
-Bundle 'vim-scripts/greplace.vim'
-Bundle 'vim-scripts/tComment'
-Bundle 'xenoterracide/html.vim'
+if filereadable(expand("~/.vimrc.bundles"))
+  source ~/.vimrc.bundles
+endif
 
 filetype plugin indent on
 

vimrc.bundles

@@ -0,0 +1,32 @@
+set nocompatible
+
+filetype off
+set rtp+=~/.vim/bundle/vundle/
+call vundle#rc()
+
+" Let Vundle manage Vundle
+Bundle 'gmarik/vundle'
+
+" Define bundles via Github repos
+Bundle 'croaky/vim-colors-github'
+Bundle 'danro/rename.vim'
+Bundle 'kchmck/vim-coffee-script'
+Bundle 'kien/ctrlp.vim'
+Bundle 'nanki/treetop.vim'
+Bundle 'thoughtbot/vim-rspec'
+Bundle 'timcharper/textile.vim'
+Bundle 'tpope/vim-bundler'
+Bundle 'tpope/vim-cucumber'
+Bundle 'tpope/vim-endwise'
+Bundle 'tpope/vim-fugitive'
+Bundle 'tpope/vim-haml'
+Bundle 'tpope/vim-markdown'
+Bundle 'tpope/vim-rails'
+Bundle 'tpope/vim-surround'
+Bundle 'tsaleh/vim-matchit'
+Bundle 'vim-scripts/ctags.vim'
+Bundle 'vim-scripts/greplace.vim'
+Bundle 'vim-scripts/tComment'
+Bundle 'xenoterracide/html.vim'
+
+filetype on