Split vimrc & many other changes.

* Splitted vimrc, into 2 part
    1. main file: vimrc.
    2. neobundle bundles configurations, which is symlink in vimrc.d
    refers to one of files under vimrc.d/neobundle.d.
* Replaced the old function mudox#auto_colo#AutoColoRandom() with 2 new
  function:
    1. mudox#auto_colo#AutoColoRandomRC()
    2. mudox#auto_colo#AutoColoRandomAfter()
* Assigned \cc to shuffle color combinations after gvim initialized.
* Write a bash script to switch between neobundle bundles configurations.
* Currently 2 neobundle bundles config created.
    1. all_enabled
    2. xolox_disabled
Enable more CtrlP extensions.

* They are 'lien', 'tag', 'mixed', 'rtscript'.
* Correspondingly, assigned <C-P>* mappings to invoke them.