Updated the push operation to use the asynchronous endpoints and removed old workarounds that are no longer necessary.
Fixed an issue that was causing 401 errors due to duplicate headers being set. Removed obselete workaround for passing the auth arguments.
Merge branch 'master' into devel

Conflicts:
	pom.xml
	src/main/java/org/jboss/pressgang/ccms/zanata/ZanataInterface.java
	src/main/java/org/jboss/pressgang/ccms/zanata/ZanataProxyFactory.java
Reverted using the asynchronous create endpoint since it is only experimental.