bumping isis-module-security to 1.7.0-SNAPSHOT

because 1.6.2 is incompatible with 1.7.0-SNAPSHOT and 1.8.0-SNAPSHOT
Bumping to 1.7.0 for Isis and all addons.
fixing breakages resulting from change to API in fullcalendar 1.6.2
Run against Isis 1.8.0-SNAPSHOT, disable custom application.css
Bumping up to use 1.8.0-SNAPSHOT of isis-wicket-* addons.