Fix for issue 140. Appends the relationship name to the update container ID. E.g. having two relationships from movie to "studio", one named studio and one named "coStudio", the resulting IDs will be "MUC_EditRelationshipEmbeddedStudio_studio" and "MUC_EditRelationshipEmbeddedStudio_coStudio".
Merge pull request #561 from fbarthez/wonder-140

tested on my app and looks OK
Fix for issue 140. Appends the relationship name to the update container ID