New plugins & Configuration Added & auto_colo refactored.

* New plugins.
    vim-json
    trailertrash
* New colorscheme 'tomorrow'
* Refactored auto_colo.
    I'm planning to turn it to a separate plugin.
    Named it "color funny toy".
    Refactored the color file discovering function use pure VimL.
Reorganized colorscheme bundles.

* Merge all colorscheme bundles into neobundle direcotries, not under
  separate folder any more, and no <vim>/colors for collecting them.