#651 - Handle deleted users

User should left all his groups when deleting account.
#651 - Fix NPE when user in a group is deleted
Merge pull request #652 from jchampemont/master

Handle deleted users
Started updating the groups section in the Account
fix #651: handle deleted users.
Merge pull request #655 from adericbourg/master

fix #651: handle deleted users.
Add missing jquery.placeholder.js asset in wro4j config
Merge pull request #656 from jxerome/master

Add missing jquery.placeholder.js asset in wro4j config
Correct incorrect == String equality.
Make verification of the right to modify user/group association more explicit and reduce code replication.
Merge pull request #657 from jxerome/equal-compare

Correct incorrect == String equality
Started working on accounts page - preferences
Merging with upstream/havoc
Merge remote-tracking branch 'upstream/master' into havoc
Revert "Merge remote-tracking branch 'upstream/master' into havoc"

This reverts commit 14061140d58a42b6ffa5bca82ea31f5ebc837880, reversing
changes made to fc7cb79a8c77ad2b969d80784ff5bb60b67a916a.
Merging with upstream/havoc
Started working on sections of the account page
Delete Groups.html
Merge pull request #667 from hegek87/havoc

Starting to work on account preferences