Use pure Korn shell syntax for functions.
Switch default `case` snippet indentation.
Support putting `then` on the next line.
Recognize `+` as a variable expansion operator.
Support interpolation inside parameter expansion.

Closes #9.
Add a `do … done` loop snippet.
Merge remote-tracking branch 'origin/master'

Conflicts:
	info.plist
Merge remote-tracking branch 'upstream/master'