Hydrilla

don't include schema patch version number in generated instances

update schema versions to 1.0.1

enable using with Python 3.7

make "uuid" an optional property

specify full schema URL in instances

when generating JSON documents, put generating software info in 'generated_by' property

make resource dependency specifier an object

change file path format

From now on we'll be using format 'file/sha256/' instead of 'file/sha256-'.

include new schemas in package and in tests

fix typing mistake i tests