Refs #427. Added tests to make sure getCommonParentList works properly in converting list types.
Refs #427. Added tests to make sure getCommonParentList works properly in converting list types.

samuelcole/wymeditor,samuelcole/wymeditor,samuelcole/wymeditor,samuelcole/wymeditor,samuelcole/wymeditor,samuelcole/wymeditor