context-aware bracket wrapping

[ymendel]

It would be awesome if the bracket wrapping knew about where I was at the moment and was was acceptable. I super, super want to be in a double-quoted string in a language like Ruby, have something selected, hit # and see it wrapped correctly, like so:

1. I'm in some code like var = "@something-name"
2. I select @something
3. I hit #
4. I get var = "#{@something}-name"

[deiga]

I'm currently working on this, but can't get tests to work, since I can't figure out how to specify in what scope the editor currently is.

[kevinsawicki]

Fixed by #70