Support {{angular}} in mobile.ScrollView's template

[Ticket 817780]
Fix undefined var
fix destroying scope
Update Angular version
Compile content of locked columns in Grid.  Fix #316
Remove outdated comment.
Only call widget.destroy() if widget.element is not null. Fix #319

(seems the nested grid in the demos is destroyed already at the time we try
to destroy the outer one)
Merge branch 'master' into gh-pages