Remove ignore=dirty from .gitmodules.

Removing ignore=dirty from .gitmodules to replace it with what we really
want: Add *.pyc to global git ignore list.
Merge pull request #739 from glogiotatidis/update-gitmodules

Remove ignore=dirty from .gitmodules.
Add django-database-email-backend dependency.
[bug 1007077] Add example to enable email debugging in local settings.
Merge pull request #736 from johngian/debug-emails

Email debugging.
[bug 1006951] Do not pre-select the mentees of a mentor in the email form.
Merge pull request #741 from akatsoulas/1006951

[bug 1006951] Do not pre-select the mentees of a mentor in the email form.
Add statsd counters for inactivity notifications.
[Fix bug 997275] Build event metrics management interface.

* Remove old metrics related_name.
* Add EventMetric and EventMetricOutcome models.
* Show EventMetric to base content.
* Fix /stats/ URL conflict with admin URL.
* Register new models to admin.
* Minor fixes in new models Meta.
* Replace old metrics with new metrics.
* Remove unused code from old metrics.
* Change templates to handle new metrics.
* Minor compatibility fixes between old and new metrics.
* Add factory for new metrics
Merge pull request #725 from johngian/997275-metrics-interface-dev

Build event metrics management interface.
Merge pull request #738 from johngian/add-stastsd-notifications

Add statsd counter for inactivity notifications.
[fix bug 996064] Display reps unavailable status in various places.
Merge pull request #742 from akatsoulas/996064

[fix bug 996064] Display reps unavailable status in various places.
Add django-import-export and friends.
Add django-import-export to admin interface.
Increase the number range for the bug_id field.