0.9 WIP

Contains #128 by Dominic, a .jshintrc update and some README updates. Will probably also include #127 by @mcollina.

I'm also considering removing *leveldown* from the deps list for this release too, it's a big step though, but I haven't heard any negative feedback from #119 as long as we keep the ***level*** package up to date and available for people wanting a fully bundled option. There's more activity now implementing LevelDOWN compatible interfaces, particularly by @maxogden and @No9, so it's making more sense to do this now.