Add configuration for plugin 'YankRing'

* Add configuration for 'YankRing'.
    Move YankRing's history file to ~/.vim.
* Add rules to exlude yankring_hist* files into .gitignore.
Put color schemes under control of 'neobundle'

* Add configurations let neobundle track color schemes.
    * Create a directory 'colos_neobundle' to hold repos of color
    schemes.
    * Copy color scheme .vim files to ~/.vim/colors automatically.
    * Following existing color scheme is under control of 'neobundle':
        * jellybeans
        * molokai
* Add new color schemes:
    * badwolf
    * hybrid
* Add rule to ignore 'colos_neobundle/'.
* Add some of my snippets file to 'mdx_ultisnips'.