Adds GPLv3 license file.
Merge pull request #3 from takeit/master

Newscoop Paywall Plugin
Merge pull request #4 from hlmnrmr/master

Adds GPLv3 license file.
Merge pull request #5 from takeit/master

Newscoop Paywall Plugin PR#2
Merge pull request #6 from takeit/master

translations fix
conflicts fix