Support for schema draft-07

[Muffo]

I have just started to look at JSON Schema and the current line seems to be causing some issue with the tool.

"$schema": "http://json-schema.org/draft-07/schema#",

Error message:

jsonspec.validators.exceptions.CompilationError: ("u'http://json-schema.org/draft-07/schema#' not registered"

Changing this to draft-04 will solve the error, but then I'll get a bunch of warnings because I am using "format" values that are not supported yet.

Is there a plan to support draft-07? I am currently using version 0.9.11, which I got from pip install.

Thanks!