Enable tmux to send-prefix using C-a a

* It's useful when you have a tmux session into another tmux session
  (ie. via ssh).
Merge pull request #402 from imobach/master

Enable tmux to send-prefix using C-a a
Added syntax highlightning for tmux.conf
Spring rspec alias
Make :Gsesarch way faster - requires to :BundleUpdate to get latest skwp/greplace.vim
test presence of persistent_undo module before use it. (prevent error msg for versions<703)
just a spelling mistake in comment
Merge pull request #406 from jeremyclement/master

Resolve error "E518: Unknown option: undofile" for vim < 7.3
Merge pull request #405 from jby/add_tmux_vim_syntax

Added syntax highlightning for tmux.conf
Allow local configuration for tmux
Merge pull request #394 from treppo/master

Allow users to overwrite the tmux configuration
Fix token color customization for CodeRay >= 1.1.0

See: https://github.com/rubychan/coderay/commit/e2acec3ef141725d2fc264e56d1aa18e838c6acf
     https://github.com/pry/pry/issues/1012#issuecomment-29213405
Compare version numbers properly
Remove setting 256 colors for solarized on terminal vim
Merge pull request #410 from treppo/master

Remove setting 256 colors for solarized on terminal vim
Revert "Merge pull request #410 from treppo/master"

This reverts commit 6e344fef4e00914d3a2e8955f48cf5ca7479a945, reversing
changes made to 4c88ca6e45dfb9b2bd80f1ff3eebd84e7b5d885d.
Merge pull request #409 from c0nspiracy/fix-coderay-customization

Fix token color customization for CodeRay >= 1.1.0
Readme cleanup
Remove setting 256 colors for solarized on terminal vim
Merge pull request #412 from treppo/solarized-vim

Remove setting 256 colors for solarized on terminal vim