[stylish] Add single txt file with styles and add GitHub style
[.vimrc] Use en_us for spell-checking language
[.vimrc] Activate rainbow parentheses not on Vim enter

To fix spell-checking (which is broken by rainbow parentheses) in files
with no file type
[.gtkrc-2.0.mine] Enable mnemonics and accels so Chrome works
[stylish] Add bitbucket.org style