Change Maven artifact group id to com.aodocs.endpoints

Support Endpoints Portal authorization flow

• Add authorizationUrl and useScopesInAuthFlow issuer config params
• Define default authorizationUrl for Google id token issuers
• Add scopes in operation's security (required for Try it! in Portal)
• Add authorizationUrl in OAuth2 flow (required for Try it! in Portal)
• Reorder Google id token issuers to have https:// one first

New supported Swagger features

• Support deprecation on Swagger operations with @deprecated
• Add tags to Swagger operations to group like API Explorer in Portal
• Inline Map types (including JsonMap) to avoid useless definitions
• Set default values for parameters
• Add proper collection format (multi instead of csv)

Order consistency

• Remove ordering attempt in reflection-based introspection
• Add ordering in Swagger generation (sort paths by string order)

Testing

• Improve coverage of SwaggerGenerator (array tests)
• Extract Swagger assertion logic in a truth.dev subject
• Update truth.dev to 1.0