Set check_mozillian_username execution soft time limit.

check_mozillian_username has been taking more than 120secs on celery to
complete and thus hitting the execution soft time limit. Raise the time
limit only for this function to 5 mins to solve this.

Also restore the previous execution schedule (once per day) of the task.
Merge pull request #726 from glogiotatidis/task_time_limit

Set check_mozillian_username execution soft time limit.
[fix bug 996059] Create a form allowing reps to become available/unavailable.
Merge pull request #724 from akatsoulas/996059

[fix bug 996059] Create a form allowing reps to become available/unavail...
[Fix bug 967026][Fix bug 970395] Email reps when inactive for 4/8 weeks.
Merge pull request #710 from johngian/967026-email-inactive-reps

Email notifications for inactive reps.
[Fix bug 984588] Aggregate inactive reps in stats dashboard.
[fix bug 896778] If possible, prepopulate timezone from user's profile.
Merge pull request #704 from akatsoulas/896778

[fix bug 896778] If possible, prepopulate timezone from user's profile.
[fix bug 1002420] Optimize longest streak calculation.

* Include only the users with a report in the last 24 hours, in the calculation.
PR changes

* Change thead tbody order
* Fix queries and dates
Merge pull request #717 from johngian/984588-aggregate-inactive

[Fix bug 984588] Aggregate inactive reps in stats dashboard.
[fix bug 974344] Don't display ical banner when subscribing to past events.
Merge pull request #727 from akatsoulas/1002420

[fix bug 1002420] Optimize longest streak task.
[Fix bug 967026][Fix bug 970395] Fix inactivity notification emails.
Merge pull request #728 from johngian/fix-notifications

[Fix bug 967026][Fix bug 970395] Fix inactivity notification emails.
Fix typo in edit_ng_report template.
Merge pull request #730 from akatsoulas/template-fix

Fix typo in edit_ng_report template.
[bug 996059] Update unavailability db fields.
Revert "Fix inactivity notification emails."

This reverts commit 204df74e4b06b36cc9761964fbe2204a7d186b1d.