Various presentation fixes
Merge branch '0.6.4' of https://code.grnet.gr/git/astakos into 0.6.4
Conflicts: snf-astakos-app/astakos/im/forms.py
Minor fixes
- Help text for modearation_enabled field- Terms of use=> Terms of service
New font (Open Sans)
Add group homepage field
Refs: #2793
Display only enabled groups in group search
Add submenu
Add billing tab
Indermediate page for create group
Style changes in create group form
View revisions
Also available in: Atom