Update README.md
Update README.md
Merge branch 'xml-fix'
merging with xml-fix
Code clean up, no change
Merge branch 'master' into xml-fix

Conflicts:
	prov-json/src/main/java/org/openprovenance/prov/json/JSONConstructor.java
	prov-json/src/main/java/org/openprovenance/prov/json/ProvDocumentDeserializer.java
	prov-json/src/test/java/org/openprovenance/prov/json/RoundTripFromJavaTest.java