Merge branch 'release/0.1'
Merge branch 'release/0.2'
Merge branch 'release/0.3'
Merge branch 'release/0.4'
Merge branch 'release/0.5'
Fix bug in resource traversal

Omitting resources that have a class of kind NSNull (this class is used to indicate, that property should be set to nil).
Set Version to 0.5.1
Merge branch 'hotfix/0.5.1' into develop