Rename EAVariableDescription to VariableDescription
fix verbose name of VariableDescription
Migration for renaming EAVariableDescription
Rename EAVariableCodeDescription to VariableCodeDescription
Migration for renaming EAVariableCodeDescription
Rename EAVariableCodedValue to VariableCodedValue
Migration for renaming EAVariableCodeValue
Propagate name changes to tests
Add Source model
Migration for adding Source
Change variable number to label, add source FKs
Migration for changing number to label
Update tests to use variable.label instead of variable.number
Update load.py to change variable number to label
Update views for EA model changes
Update api_views and angular UI for EA Model changes

Address JS part of #49

Have not renamed classes in api_views or serializers yet
Merge pull request #51 from NESCent/refactor_society_variables

Refactor society variables