Move TMX DTD
Update to latest parent pom and add xom dependency
Allow creationDate and lastChanged to be set explicitly
Switch TMXParser to ElementBuilder; Change TM metadata to use Json
Merge branch 'tm-import' of github.com:zanata/zanata into tm-import

Conflicts:
	zanata-model/src/main/java/org/zanata/model/tm/TMTransUnitVariant.java
	zanata-war/src/test/java/org/zanata/model/TransMemoryJPATest.java