[fix bug 860469] Add instructions to profile explaining how to change email address
Merge pull request #456 from fxa90id/Bug_860469

[fix bug 860469] Add instructions to profile explaining how to change email address
[fix bug 860339] Update group url matching regex.
[fix bug 866662] Calculate group unique url based on aliases.
[fix bug 860339] Randomize avatar filenames.
[fix bug 866677] Allow /csp/report through StrongHold Middleware.
[fix bug 704081] Add attribution to use of Tumbeasts
Merge pull request #463 from Falkulator/attribution

[fix bug 704081] Add attribution to use of Tumbeasts
[fix bug 859945] Task to delete empty groups.
Merge pull request #462 from glogiotatidis/866677

[fix bug 866677] Allow /csp/report through StrongHold Middleware.
Merge pull request #461 from glogiotatidis/849712

[fix bug 860339] Randomize avatar filenames.
Merge pull request #459 from glogiotatidis/859945

[fix bug 859945] Task to delete empty groups.
Merge pull request #460 from glogiotatidis/860339

Stuff for groups