Replace PIL with pillow.
Merge pull request #859 from glogiotatidis/pillow

Replace PIL with pillow.
[fix bug 979825] Add Mozilla Reps to External Accounts.
[bug 973387] Add required star to new member criteria.

Commit 5f7a0df partially undid commit 115c837. This commit fixes that.
[fix bug 984298] Check that identifier exists before cleaning.
Merge pull request #862 from glogiotatidis/984298

[fix bug 984298] Check that identifier exists before cleaning.
Merge remote-tracking branch 'upstream/master' into 962712