Added Facebook like tendenci code to photo set view and individual photo detail view.
Merge pull request #321 from bpotterschipul/modify-photos

Added Facebook like tendenci code to photo set view and individual photo...
Defaulting event registration price to 0 if price field is not available
Updating invoice creation for forms.
Membership preview defaults to users customer var else request-user var
Removing custom bulk delete option.
#194 #195: Updated list_event, added list_corporate_memberships

Conflicts:
	tendenci/addons/corporate_memberships/templatetags/corporate_memberships_tags.py
#195: Updated start_dt filter in order if-clause

Conflicts:
	tendenci/addons/events/templatetags/event_tags.py
PEP8 changes for events_tags
Added docs for start_dt option in event_tags
Remove non-standard quick-options.
Update identifier for membership export
Management command to export group members and group subscribers
Set status_detail to pending if not specified on save for MembershipDefaults
Set default base number to 5000 if the setting MemberNumberBaseNumber doesn't exist for some reason
Reverse back the previous update for is_approved
Assign member_number on approval if not exists
Version bump
Creating export front pages - process, status and download - for group members and subscribers
Switch to the new export links on group detail page