Add a failing test for #7
Put cursor on empty line after return in braces

When return is pressed with the cursor inside a matching pair, add an
empty line between the braces, move the cursor there and autoindent.
Implements the behavior discussed in #7, but breaks some other specs.
Merge pull request #12 from ilkka/curly-brace-autoindent

Leave cursor on blank autoindented line when return pressed within matched pair
Add spec for undo, fix undo with transaction

Do all inserting in a transaction so that a single undo step undoes
entire empty line insertion.
Merge pull request #13 from ilkka/curly-brace-autoindent

Add spec for undo, fix undo with transaction
Activate javascript package for indent column
Prepare 0.24.0 release
Auto indent row of closing bracket

Refs #7
Prepare 0.25.0 release