[Uploadable] Allow build path relative to default using "pathMethod" property.
Fixed tree-parent mapping for mapped superclass
Merge pull request #786 from InformaticRevolution/master

Fixed tree-parent mapping for mapped superclass
Created referenceManyEmbed

* to get the list of object that have an embed reference to this one
* Added tests for referenceManyEmbed
Merge pull request #783 from Azer-/master

Added referenceManyEmbed
Merge pull request #779 from Koc/uploadable-path-relative-to-default

[WIP] [Uploadable] Allow build path relative to default using "pathMethod" property
[tests] closes #773
closes #772