Unicode parsing is wrong for letters
Sync JML for Unicode parsing
StructureDescription: added "onPostValidate" hook for finalization of parsed structure
value_description: invoke onPostValidate on parent descriptions
value description: ensure that non-Z timezones are correctly parsed
Merge pull request #81 from datacratic/UnicodeParsing

Unicode parsing is wrong for letters
added comparison operator to type "Optional"
Merge branch 'datacratic-internal-branch-2' into async-http-client