Update readme for 3.1
Fix missing language
Change path of packages to 3.1/
Remove some old array usages
Test for some special keys
Sort validation messages by key
Allow specifying the phpbb version in the url
Add validation of 3.0 into 3.1
Allow plural in 3.0 datetime.AGO
Correctly validate plurals in 3.1
Update readme and add php 5.6 to travis
Switching to master