Remove two unused and identical directives

WTF dude?
Remove another unneeded and ridiculous directive
Remove some more unused directives
add visual cues for parts of spreadsheet that allow to add data in edit mode
Update sbt-angular-templates to 0.2
editing is bo-able
Fix typo in Container.remove

Fixes #2499
Fix excerpt clearing

Stupid coffeescript of vs. in.  Fixes #2512