[doc] Documented general configuration
[doc] Added (partially) pugin documentation

Change-Id: I7162456cca3dca4af4366c2d0126b3be8bf36afb
[config] Added the 'equalalways' option

Change-Id: I81811a3b5fbceb4b66fbd80f658302027261646a
[config] Added the 'molokai' colorscheme

Change-Id: I176a2f7355ffef23481978aa4c2082f8a8165671
[plugin] Show line numbers in nerdtree
[plugin] Added global ycm_extra_conf.py
[plugin] Removed black background coulor from diff signs
[plugin] Changed snippets mapping in ultisnips

Change-Id: Ic1b09ad97856c9646563dc54049548bd3edf36a3
[config] Added global '.ycm_extra_conf.py' config file with clang flags
         for the autocompletion in YouCompleteMe plugin

Change-Id: I8951c40aa55e06ab6387ecbfcd07760b53dff73b