Update south to version 0.8.1.

A bug exists in versions >0.8.1 where fixture loading does not respect
defined "pk"s which results in multiple tests failing. This version is
good enough for us now, as what we need is the --update command which is
available.
[fix bug 989110] Send email notification to Council for a budget request.

* Remove send_mail_task.
* Refactor send_remo_mail.
Merge pull request #689 from akatsoulas/989110

[fix bug 989110] Send email notification to Council for a budget request...
[fix bug 970749] Raise 404 error in month2number method if the input is wrong.
Merge pull request #701 from akatsoulas/970749

[fix bug 970749] Raise 404 error in month2number method if the input is ...
Merge pull request #698 from glogiotatidis/upgradesouth

Update south.
[bug 993550] Remove fixtures of the old reporting system.

*Minor updates in documentation.
Merge pull request #702 from akatsoulas/993550

[bug 993550] Remove fixtures of the old reporting system.
[fix bug 981332] changed the year in copyright statement from static to dynamic
[bug 970749] Move month2number exception handling to view.
Merge pull request #703 from glogiotatidis/970749

[bug 970749] Move month2number exception handling to view.
[fix bug 996551] Remove requestee bugzilla flag checks.
Merge pull request #705 from glogiotatidis/996551

[fix bug 996551] Remove requestee bugzilla flag checks.
[fix bug 989110] Correct bug number in council discussion email.
Merge pull request #707 from glogiotatidis/votingfix

[fix bug 989110] Correct bug number in council discussion email.
[fix bug 996603] Do not cc remobot when sending out emails.
Merge pull request #706 from akatsoulas/remove-cc-field

Do not cc remobot when sending out emails.
Merge pull request #700 from anushbmx/master

[bug 981332] changed the year in copyright statement from static to ...
[Fix bug 984573][Fix bug 951503][Fix bug 986073] Add colors to mentees section.

* Add helper to get inactivity level and last report date
* Change activity periods in dashboard.
* Add color to indicate inactivity level.
* Add reference for inactivity levels. Change page header.