it is necessary to login to create custom access token

#63 feat: implement login for rocketChat api; add new fields for rocketChat information to user database

# Conflicts:
#	gemeinsamforschen/src/main/java/unipotsdam/gf/core/states/PhasesImpl.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/core/states/model/Constraints.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/interfaces/ICommunication.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/interfaces/IPeerAssessment.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/assessment/controller/service/AssessmentDBCommunication.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/assessment/controller/service/FBAssessement.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/communication/service/CommunicationDummyService.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/journal/service/JournalServiceImpl.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/journal/service/ProjectDescriptionImpl.java
#	gemeinsamforschen/src/main/webapp/journal/edit-description.jsp
#	gemeinsamforschen/src/main/webapp/management/js/changePhase.js

# Conflicts:
#	gemeinsamforschen/src/main/java/unipotsdam/gf/config/GFApplicationBinder.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/core/management/ManagementImpl.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/core/management/user/Menu.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/core/states/PhasesService.java
#	gemeinsamforschen/src/main/java/unipotsdam/gf/modules/assessment/controller/service/PeerAssessment.java
#	gemeinsamforschen/src/test/java/unipotsdam/gf/interfaces/PhaseTest.java
#	gemeinsamforschen/src/test/resources/database/fltrail.sql