Removed line giving an error from gvimrc
Changed vimrc to
  - use railscasts theme from edouardp rather than jpo on Github
  - Made 'YouCompleteMe' condition on not being win32
  - Added 'vim-ps1' syntax file bundle
  - Added 'tagbar' bundle
  - Removed win32/unix test for vimnifo
  - Commented setting the columns to 84 (gvimrc can do that if it wants)
  - Added some configuration for Tagbar and NERDTree