Added externalapps app. Changed setup.py to use entry_points. Added MOOCNG_EXTERNALAPPS into common.py
Added MOOCNG_EXTERNALAPPS_FORBIDDEN_WORDS in common.py for future use
Change name PluginRegistry to more appropiated ExternalAppRegistry
Added model ExternalApp and some logic to the app.
Added migrations
Changes in status.
General improvements
Added fk to course. Added external apps to info html
Fixed typo.
Added frontend (views, templates...) for external apps creation.
Added frontend for user. Added Some improvements
Added celery tasks to create instances in remote servers. General
improvements in externalapps app.
Added celery tasks to create instances in remote servers. General
Added support for creation remote instances for askbot and some general improvements
Merge branch 'master' of github.com:OpenMOOC/moocng into feature-course-plugins
Fixed error on instances creation. General improvements
Added new variables for instances creation
Deleted test method
Fixed errors. Improved validation. Deleted old migrations.
Deleted commented code