Synced with linux-neobundle

* Using g:vim_config_root to remove discrepanies between
  linux-neobundle/vimrc and win32-neobundle/vimrc as much as possilbe.
Synced with linux-neobundle

* Removed mdx_ultisnips, and made it a separate plugin.
* Removed configurations for autopairs.
* Cleaned up neobundle bundle names, replace all '-'s with '_'s.
* Bring back customized foldtext settings, and beautified it.
* Depressed the use of bold text style for solarized colorscheme.