Fixes, new colors, code style

* Use neobundle#begin, neobundle#end for latest NeoBundle.
* Force airline theme to badwolf.
* Change airline separators to look nice when powerline is off.
* Add Shougo/neosnippet-snippets plugin.
* Use faith/vim-go instead of jnwhiteh/vim-golang.
* Do not use NeoBundleLazy with TagBar, since vim-go checks for its
  existence to enable certain features.
* Change some display settings in unite.
* Add vim-puppet and vim-fish plugins.
* Set colorscheme at end of config.