Fix deprecation warnings.

* Replace 'django.conf.urls.defaults' with 'django.conf.uls'.
Merge pull request #746 from akatsoulas/deprecation-warnings

Fix deprecation warnings.
[fix bug 1009018] Responsify HTML tables on Reps
Update Mapbox ID for local development
Merge pull request #747 from alexgibson/no-bug-update-mapbox-id

Update Mapbox ID for local development
Merge pull request #745 from alexgibson/bug-1009018-responsify-html-tables

[fix bug 1009018] Responsify HTML tables on Reps
[bug 996064] Better unavailable message on personal profile page.
Merge pull request #750 from glogiotatidis/unavailablemessage

[bug 996064] Better unavailable message on personal profile page.
[fix bug 996073] Notify mentors and reps about unavailability.
[bug 996059] Remove settings page from Mozillians group.
Merge pull request #735 from akatsoulas/996073

Send unavailability notifications and update permissions.