Improved documentation
Change SWAGGER2_YAML_MODULE environment variable
Add Swagger 2.0 schema
Rewrote Swagger2::SchemaValidator
Add cache for http://json-schema.org/draft-04/schema
Add Swagger2::validate() method

  - Refactored load()
  - Add cache capabilities
  - Add specification() attribute
Fix expand()
Fix "required" in Swagger2::POD
Fix SchemaValidator: required and properties in items
Mojolicious::Plugin::Swagger2 use new validation API
Released version 0.03

       * Add Swagger2::validate()
       * Add Swagger 2.0 schema
       * Fix circular $ref when expanding a document
       * Rewrote Swagger2::SchemaValidator to support draft 4