allows scope to read props from undefined for #1314
Merge pull request #1335 from bitovi/scope-reads-props-from-undefined

Allows scope to read props from undefined
Properly use parseModel(s) and allow extension (#1246, #1272).
Merge pull request #1325 from bitovi/model-prop-overwrite

Properly use parseModel(s) and allow extension
Update compute.read to also return constructor functions. Adding another test for #1261
Merge pull request #1332 from bitovi/compute-read-1261

Update compute.read to also return constructor functions
Allow properties to be set on Scope.