- Added UserEmailSchoolDataIdentifier
 - Added synchronization of users' and students' email addresses
 - Fixed null response (204, 404) handling in AbstractPyramusClient
Merge branch 'FTR-46_PYR' of https://github.com/otavanopisto/muikku.git
into FTR-46_PYR

Conflicts:
	muikku-core/src/main/java/fi/muikku/schooldata/initializers/SchoolDataEntityInitializerProvider.java