Fixes issue where given two objects A and B. If A is embedded into B success. If B is then embedded into A a too much recursion error occurs.
Merge remote-tracking branch 'upstream/master'
Fixed issue where given two objects A and B. If A is embedded into B success. If B is embedded into A a too much recursion error occurs. Also fixed indentation from previous commit.
Merge pull request #49 from neonnds/master

throw exception when trying to embed a parent cell (prevent recursion)