Vim: Improve highlight user experience (auto-clear)

Add:
 * Unset last search pattern upon 'return'

Remove:
 * ,h to remove highlighting (as it is now done using 'return')
Vim: Add functionality for quick global file replace of selected text

Add:
 * Functionality to perform a quick global file replacement of the
   selected text using ,z
Vim: Fix typo on snipmate author name
Vim: Improve CtrlP (respect ignores, increase limit, fix buffer map)

Remove:
 * Unix command option (simpler to use default and it obeys additional
   built-in options)

Add:
 * Additional ignores (.class) for CtrlP
 * Ability to search hidden file/dir with CtrlP

Fix:
 * CtrlP buffer map to ,e so it does not clash with BufKill's maps
 * A higher max file limit for CtrlP (for large projects)