Support The Silver Searcher (ag) as ack replacement

https://github.com/ggreer/the_silver_searcher#vim
Update fugitive plugin.
Merge pull request #506 from vassilevsky/silver-searcher-support

Support The Silver Searcher (ag) as ack replacement
Merge pull request #507 from rdlugosz/update_fugitive_to_cf3fe781dd

Update fugitive plugin.
Update the submodules
rm vimclojure bc it's deprecated, add vim-clojure-static
with https
Merge pull request #509 from Quantisan/master

replace langs/clojure vimclojure with new vim-clojure-static
Update to new pathogen API
Merge pull request #511 from tpope/pathogen-update

Update to new pathogen API
Remove the solarized color from the Sampler-Pack

closes #489
NERDTree mirror mode by default

closes #382
Add Elixir lang plugin
Merge pull request #510 from brunohenrique/master

Add Elixir lang plugin
Set Guardfile file type to Ruby
Merge pull request #513 from vassilevsky/guardfile_support

Guardfile is not syntax-highlighted as a Ruby script
Change the URL of irblack to point to the original color scheme.

closes #515
Update all submodules
updated snipmate to vim snippets
typo fix