Add support for matching angle brackets

Angle brackets ('<' & '>') can now be matched using %
Update .gitignore to ignore g_sociomantic

g_sociomantic contains Sociomantic specific aliases etc. which shouldn't
be committed to the public domain.
Update path of startup file for xmonad to launch
Ask for my ssh passphrase at every login
Move plugin specific stuff to separate file
Introduce ag.vim plugin
Remove duplicate commands from vimrc
Fix paths in bashrc
Move autocmds to a separate file
Introduce functions file

Setting the vertical bar (colorcolumn) is now function based. The
position of the bar depends on the set textwidth for the current buffer.
gitignore update