XSD schema fix for inline Base64 file data GNUEPRINTS-145
Comments and formatting
Merge pull request #264 from QUTlib/feature/base64-xsd-fixes

XSD schema fix for inline Base64 file data
clean up possible_doi logic

* don't mangle the $value string before testing it
* make the 'doi:' namespace pattern match more stupid permutations I've
  seen in the wild
* make sure the test matches the entire string