Allow non-admins to approve pends

The setting:
"ADVANCED_USERS_CAN_ACCEPT_PENDING" (default: False)

Can be used to allow "advanced users" (based on reputation) to approve
or reject pending
Merge pull request #70 from ahinz/topic/allow-non-admins-to-optionaly-approve-pends

Allow non-admins to approve pends
Rotate photos based on EXIF orientation
Whitespace cleanup
Merge pull request #71 from ahinz/bug/rotated-images

Rotate photos based on EXIF orientation