Version 1.79

Changes since 1.7.6:
* New options:
  + g:ctrlp_tabpage_position
  + g:ctrlp_open_func
  + g:ctrlp_key_loop
  + g:ctrlp_abbrev
* Extended options (accepting new values):
  + g:ctrlp_open_multiple_files
  + g:ctrlp_follow_symlinks
  + g:ctrlp_working_path_mode
  + g:ctrlp_user_command
  + g:ctrlp_switch_buffer
* Default setting changes:
	+ Disable showing of hidden files and directories.
	+ Small change for working_path_mode.
* Some minor tweaks and bugfixes.