Merge pull request #6 from splattater/develop

Fix if-null checks, add subscription to friending activity
update README and add LICENSE
add ARC2 to libraries
update license reference in README
update README, linebreaks and ontowiki-wiki-link
fix array access in NotificationFactory
Abstract subscription to resources (instead of feed)

Add subscribeToResource method, make subscribeToFeed private
Allways add resourceUri dssn:activityFeed feedUri
Clean Code
Remove subscirbe to feed form from profileshow template