update colors a bit to help notic active pane/tab better
use consistent, non-distracting colors for inactive panes, tabs
change vimux and go test shortcuts to not trample default tab navigation
fix GoFindOrCreateTest to be more idiomatically vim-y and less obnoxious
keep gofmt from freaking out and generally ruining my life about syntax errors, since Syntastic will pick them up anyway
always show tabline