Removed Inherits from field from Add/Edit class screen.

https://bugzilla.redhat.com/show_bug.cgi?id=1138859
https://bugzilla.redhat.com/show_bug.cgi?id=1138744
Merge pull request #517 from h-kataria/remove_inherits_from_class_add_edit_screen

Removed Inherits from field from Add/Edit class screen.