GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.

Changes in tags are saved to the data store. Also, when a task is created, its arbit tags are stored. Issue 696 fixed.

Tasks may be deleted by pressing 'Delete' button on the edit view. An organization admin may delete a task entity, if the task is not claimed by anyone. Issue 695 fixed.

Minor fix in tags module.

tags.py module, which contains helper class for tags, is added.

Users who claim or work on tasks may list them without having student role.

Minor linguistic changes to NOTICE file for the taggable module.

NOTICE file added to the taggable module.

Some functions which applies to scoped tags in general moved from TaskTag to Task model. Also, some stylish and whitespace changes and docstrings added.

Docstring fix for delete_tag function.

'scope' field moved from TaskTag to the parent class.

TaskArbritraryTag now has auto_delete set to True by default. Reviewed by: Lennard de Rijk

Adds a new property to taggable which automatically deletes an empty tag. Reviewed by: Lennard de Rijk

Fixed an error with the task_history not being loaded when it was empty.

Fixed 'Register as a student' link problem for GHOP program. Params and new_params in student view are also sub-merged now, so the apply pattern may be used by GHOP student view.