V 1.3

[dorey]

• can verify against a json schema with FormPack parameter:
  strict_schema=True
• can pass custom parameters to "replace_aliases" to permit other types beyond the listed pyxform types
  allowed_types={'custom_type': ['custom type aliases']}

[coveralls]

Coverage increased (+0.1%) to 74.239% when pulling 8d0d9ca on v-1.3 into a6c9ad2 on master.