Add missing endif in crystallography mako template
Merge pull request #4927 from mitocw/cg/add_missing_endif

Add missing endif in crystallography mako template
Added Jonathan Piacenti to the AUTHORS file.
Merge pull request #4933 from Kelketek/jp_authors

Added Jonathan Piacenti to the AUTHORS file.
Verify children are rendered before allowing drop into collapsed parent.

TNL-56
Clarify the effect of changing problems
Merge pull request #4903 from edx/ahodges/doc/DOC263

Clarify the effect of changing problems
Update translations (autogenerated message)
Merge pull request #4940 from edx/sarina/082214-translation-update

Update translations (autogenerated message)
Merge pull request #4923 from edx/zub/bugfix/tnl56-dragdropintocollapsedunit

populate children of unit collapsed drop location
Unflag Group Configurations, Render only existing children in staff view of split_test.