reworking vimrc; tmux conf
Crosshair cursor; background color toggle.
New vim plugins
Submodule vim/bundle/SearchComplete 0000000...d85ccf8 (new submodule)
Submodule vim/bundle/ag.vim 0000000...b0d5073 (new submodule)
Submodule vim/bundle/nerdcommenter 0000000...0b3d928 (new submodule)
Submodule vim/bundle/vim-surround 0000000...42e9b46 (new submodule)
Tell tmux to use 256color terminal.