disable ruler, it doesn't display in vim-airline
disable tabgar+airline which doesn't work when tagbar isn't loaded
remove incorrect and duplicate showmatch, closes http://www.reddit.com/r/vim/comments/1w1mw2/i_rewrote_and_extensively_organized_my_vimrc/cey4u5n
make syntastic_error_symbol have leading space
conditional tagbar ingetgration for airline