Ignore IntelliJ IDEA/Webstorm module files
Added 'main' and 'scripts' properties to package.json
If the 'namespace' property of the model description is missing, the whole 'origin' object will be used.

+ Correction of the property evaluation if a 'namespace' is given in the model description.
+ Added possibility to access already evaluated properties within computed properties.
+ Added unit tests to test property evaluation with a given namespace and for computed properties.
Merge pull request #1 from MadMG/master

Fixes in properties evaluation and additional unit test cases