minor colour changes

Vertical split now invisible and current line number less yellow.
fixed focus bug when FF is first opened

Before when FF is first opened, it would gain focus on the navigation
bar
even though we had hidden it. This fix solves that problem, by losing
focus
if the bar is there.
added .vimperatorrc syntax highlighting
added file types to 's'; .c, .h, .awk, and some other unixy ones
added more vimperator files to be ignored
some vimperator history stuff