Replace getters and setters, add schema
Adjust create method
Adjust/simplify tests
Adjust create usage
Merge branch 'master' of github.com:denkmal/denkmal.org into issue-9

Conflicts:
	tests/library/Denkmal/Model/EventTest.php
Merge branch 'master' of github.com:denkmal/denkmal.org into issue-9

Conflicts:
	tests/library/Denkmal/Model/EventTest.php
Adjust structure, rename venueId to venue
Rename venueId -> venue
Rename songId -> song
Return event
Fix getter
Adjust usages, change table-name usages
Merge branch 'master' of github.com:denkmal/denkmal.org into issue-9

Conflicts:
	library/Denkmal/resources/db/structure.sql
Remove createStatic
Dont pass null for song
Merge pull request #9 from tomaszdurka/issue-9

Refactor model: Event