add a test for JWATResource (WWM-126)
  reuse WarcResourceTest.
  5 of 8 test methods fail.
clean-up JWATResource.java, add class java-doc with note on restrictions.
make all JWATResourceTest pass.
capitalize header names generated for metadata/resource record.
update one WarcResourceTest test method added on other branch to make it work for JWATResourceTest.
Merge pull request #37 from kngenie/WWM-126

Make JWATResource compliant to Resource expectations