create output ref from dnd
handle date formatting, warn when outputting bad value
delete entire output ref at once
cleanup
fire change event when updateing value
only support output refs in label field
move shared funcs to util
move code to javarosa plugin
add test cases
select output ref after insert
Merge branch 'master' into outputdnd

Conflicts:
	src/core.js
misc refactoring
Merge pull request #246 from dimagi/outputdnd

Drag and drop output ref