support for swagger 1.2 default listing paths

[fehguy]

As of swagger-core 1.2, the default resource listing has been moved from /resources.json to /api-docs.json (see https://github.com/wordnik/swagger-core/wiki/Resource-Listing). Also the default api listing path has moved to /api-docs.json/{path}.

While these are just defaults, the more frameworks that support the standards the better.

[johnraz]

Closing this in favor of #36.