removed copyField parameters. minor changes to logging. renaming of old variables to make more sense #4
Merge branch 'master' of github.com:IBMStreams/streamsx.json
some changes to prevent values from being set when input had nulls
some improvements for performance

Conflicts:
	com.ibm.streamsx.json/impl/java/src/com/ibm/streamsx/json/JSONToTuple.java
	com.ibm.streamsx.json/impl/java/src/com/ibm/streamsx/json/TupleToJSON.java
added some tests for checking null values #4
Merge pull request #8 from rohitsw/master

Multiple changes