Add BBEdit version of theme

I don't actually use BBEdit that much, but after seeing this theme linked from Brett Terpstra's blog earlier today I felt strangely compelled. BBEdit has a slightly different set of Things That Can Be Colored so in some cases they were best guesses -- and in the case of BBEdit's colors for misspelled words and Show Invisibles, kind of a "this color seems like it would probably fit" guess.