added functions to retrieve users from SecurityWebAppDatabasePopulators for use in app-specific WebAppDatabasePopulators
Merge branch 'master' of https://github.com/molgenis/molgenis

Conflicts:
	molgenis-security/src/main/java/org/molgenis/security/MolgenisSecurityWebAppDatabasePopulatorServiceImpl.java
formatting
Merge pull request #1498 from bartcharbon/master

added functions to retrieve users from SecurityWebAppDatabasePopulators ...