Added level: push_tags
Syntax fix for Ruby 1.8
Merge remote-tracking branch 'detegr/master'
Revert "Fix: Update levels to use return true syntax"

This reverts commit f71090a015d540e313e1615d5ec1ed2a0acdf7fe.
Revert "Allow for `return' in solutions"

This reverts commit 4b3bf993927e8d209dd6c809538b7470deb12aeb.