MODETOOLS-68 Create CND Editor Validation Error When A Supertype Of A Mixin Is Not Itself A Mixin
In the CND Editor, 2 new validation errors were added: (1) node type definition cannot be a supertype of itself, and
(2) a supertype of a mixin must also be a mixin. Also update pom to final Eclipse JBoss final kepler target platform.
Merge pull request #44 from elvisisking/mst-68

MODETOOLS-68 Create CND Editor Validation Error When A Supertype Of A Mixin Is Not Itself A Mixin