Add checkbox to toggle minimal label appearance

Labels (triggers) now have appearance="minimal" by default.
Fix spec extensions
Make Label textbox resizable

NOTE this also makes it possible to enter mutliline label text, which is a useful side effect.
Do not escape newlines in itextLabelWidget
Merge pull request #185 from dimagi/104234-resize-label

Make label textboxes resizable
don't crash on questions with no data block (introduced by weird forms)
Merge pull request #186 from dimagi/slimer

don't crash on questions with no data block (introduced by weird forms)
Update trigger appearance checkbox label and tooltip
Merge pull request #178 from dimagi/44263-nok-lables

Add checkbox to toggle minimal label appearance
Merge branch 'master' into develop

Conflicts:
	src/js/formdesigner.javarosa.js
	src/js/widgets.js