added (unfinished) entity classes
Merge pull request #9 from davvitt/develop

added (unfinished) entity classes
Merge remote-tracking branch 'upstream/develop'
- newest version (cant be build yet)
- newest version (cant be build yet)
- made csvreader compatible to new student model
- implemented handler for:
	- grade
	- profile
	- student
to keep logic (out of entities)
- extended test for csvreader
- implemented test for student creation