Re-enable URLHandleTest

See https://trello.com/c/IqXLdRjl/75-fix-test-url-in-urlhandletest.  All builds should be green, and ```URLHandleTest``` should appear in the reports in ```components/formats-common/test-output``` when ```ant test``` is run from ```components/formats-common```.
Would this put `\` slashes on Windows? Are URLs meant to use `/`?