Fixes/enhancements deemed critical for the ASP.Net 4/4.5, WebApi version of Swashbuckle

See https://github.com/domaindrivendev/Swashbuckle/milestone/8?closed=1 for the list of issues resolved in this release.

Revert breaking change in 5.3.1

Revert re-ordering of constructor arguments in SwaggerGenerator - it's a "public" class and is being used directly by some other libraries.

Also fixed #640

Swagger-ui upgrade to v2.1.4 and several bug fixes

The following issues should be resolved with this release:

#403, #481, #540, #541, #542, #562, #567, #588, #612, #642

Swagger-ui upgrade to v2.1.3 and several bug fixes

The following issues should be resolved with this release:

#333, #416, #450, #453, #456, #457, #464, #467, #500

Swagger-ui upgrade to v2.1.5-M2 and several bug fixes

The following issues should be resolved with this release:

#214, #236, #283, #285, #286, #288, #310, #322, #339, #343, #344, #363, #369