Add tpope/vim-rvm to the plugin list

tpope/bundler won't work without this plugin on a project
that uses dvm when mvim is not launched from within the
project's directory.
Using the command :Rvm will source the right GEM_HOME
so that :Bedit [gem] is able to look in the right place.
Add support for sourcing the right rvm env on bufenter

This extra configuration plugin calls :Rvm on every BufEnter
making sure that the right GEM_HOME and GEM_PATH are
set.
Remove csapprox from the README

csapprox has been removed from the list of default vundles so it
shouldn't be listed on the README anymore
Merge pull request #274 from duhanebel/update_readme

Remove csapprox from the README
Merge pull request #273 from duhanebel/rvm_bundler

Add support for automatically sourcing the right rvm env
Added @duhanebel to contributors list
Revert "Add support for sourcing the right rvm env on bufenter"

This reverts commit 2521763858432cec5a4ecbfa19786c5bf0234a18.
Fix a bug that was causing .vim.after to be removed after update

rake install/update was executing git clean with the -x flag that
force the removal of ignored files. Since .vim.after was listed
inside .gitignore, this was causing the file to be removed on
each update.
I don't think we need to remove ignored files since are all
temporary or user-specific configuration files that should
persist between updates.

Fixes #225
Replaced honza/snipmate-snippets with honza/vim-snippets since it seem upstream changed name
Merge pull request #283 from jby/snippet-fix

Replaced honza/snipmate-snippets with honza/vim-snippets
Changed git config/vundles
Removed some 'trailing chars' from vundles.vim, god knows how they got there