Change from AGPL to Apache 2.0
Add missing authors
Call super.__init__ from xblock.__init__
Merge pull request #245 from cpennington/call-super-init

Call super.__init__ from xblock.__init__
Implemented error handling for XBlock instances
Changed memoization
Loaded entry points before they were updated -_-
Documented more of register_temp_plugin
English Grammar
Added myself to AUTHORS
A better English fixification