Added global Mercurial ignore

This is exactly like the global git ignore bur for Mercurial.
Updated command prompt to support Mercurial branch names

if you in a Mercurial repo the branch name will now be printed in the PS1
prompt.
Updated iTerm2 settings

Changed how iTerm settings.
Added custom syntax files for PHP

This make tabs and indents match PSR and PEAR coding standards.
Added Sudow command to vim

Can now save file with sudo using the Sudow command.