Start adding tests for nodes.
Test to ensure credential definition is defined after index.registerType
Merge pull request #307 from hindessm/start-testing-nodes

Some initial tests for core nodes.
Merge pull request #303 from hbeeken/test-registerType-with-credentials

Adding test for index.registerType with credentials defined
Avoid corrupting message payload while logging.
Add more tests for function node.
Merge pull request #308 from hindessm/avoid-debug-payload-corruption

Avoid corrupting message payload while logging.
Merge pull request #309 from hindessm/more-function-node-tests

Add more tests for function node.
Adding tests for credentials.extract
Testing other codepaths in credentials.extract
Testing credential type 'password' code paths