Mutation tests have been added
Updating mutation tests according to the Sharad's recommendations
CopyNode and List tests were added
Adding Custom Node mutation tests
Updating double/integer mutation test
Refactoring CustomNode mutation test
Merge branch 'master' of https://github.com/DynamoDS/Dynamo
Test refactoring according to the structure changes
Merge pull request #2063 from vdemedetskaya/master

Mutation tests have been added