Major refactored neobundle configurations.

* All plugins' NeoBundle setttings and its own settings are put into a
  its' own setting file under vimrc.d/neobundles.d/<itsname>.
* Adjusted vimrc.d tree layout.
* Migrating the alreaded installed 100+ plugins demands time and energy.
  currently migrated:
    1. vimproc
    2. vimshell
    3. vimfiler
    4. delimitmate
    5. autoformat
* Assigened \fm to invoke :AutoFormat