ISIS-537 Bootstrapify GMap3 component
ISIS-537 Strip Wicket tags and attributes to not break Bootstrap CSS rules

(cherry picked from commit 3d55b1effec08ebe68cac7fc5992194d9751a6d1)
ISIS-537 Use font icons instead of images for the "View as" selector for collections
bumping version to 1.8.0-SNAPSHOT
changing dependency on Isis to 1.8.0-SNAPSHOT
merge 1.8.0-bootstrappify with 1.7.0 release
removing reference to isis-core-objectstore-jdo-datanucleus (no longer exists)