update to match intended implementation and add documentation for method

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
add unit tests and correct documentation

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
remove extraneous file

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
remove notion of getLocal/setLocal and ensure previously expected behavior continues

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)

Conflicts:
	source/data/ModelController.js