handle concatenated properties in the constructors extend method

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@palm.com>
Merge branch 'mvc-bindings' of github.com:clinuz/enyo into clinuz
remove unnecessary portion of test

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@palm.com>
convert mixing to enyo.kinds that are extensible

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@palm.com>