Rename model entity employee to person.
Consequent use of german skill level names and abbreviations.
Extracts SkillCategory as entity.
Refactoring: Moved views to folder per resource.
Fixes skill category relationship.
Adds year of birth to person model.
Adds some project and the relationship between project and employee
Merge branch 'ApplyNewModel'

Conflicts:
	db/seed.cypher
Fix for project modell