[tests] added parseManyHasMany() test
[tests] added OneHasMany annotation parser test
[entity] implemented support for parsins order for hasMany relationship
[entity] added support for DESC|ASC order parsing
[relationships] implemented explicit orderBy in entity annotation [closes #7]
[mapper] orderBy() reset previously set order by clause (BC BREAK!) [refs #8][refs #7]
Merge branch 'order'