Merge pull request #962 from jexp/content-encoding

fixes #961 wrong content-encoding instead of content-type charset=utf-8
Conflicts:
	community/server/src/main/java/org/neo4j/server/rest/repr/OutputFormat.java
	community/server/src/test/java/org/neo4j/server/rest/GetNodePropertiesDocIT.java
	community/server/src/test/java/org/neo4j/server/rest/web/RestfulGraphDatabaseTest.java