Fix for base path "/"

[rutchkiwi]

This fixes a problem I had with with the relative base path "/".
My swagger setup is the following:
http://localhost:8080/core/api-docs/ <- hosts the "main" api doc:

{
  "apiVersion" : "v2",
  "swaggerVersion" : "1.2",
  "apis" : [ {
    "path" : "/api/2.0/report.{format}",
    "description" : "Get reports"
  } ]
}

http://localhost:8080/core/api-docs/api/2.0/report.json <- hosts the actual api doc (for this example it's on the same server but actually it is be hosted elsewhere)

{
  "apiVersion" : "2.0",
  "swaggerVersion" : "1.2",
  "basePath" : "/",
  "resourcePath" : "/api/2.0/report",
  "apis" : [ {
    "path" : "/api/2.0/report/{id}",
    "operations" : [ {
      "method" : "GET",
      "summary" : "Fetch report data",
            ...
  } ]
}

Now, what I'd expect when i try out the "Fetch report data" endpoint, is for the URL to be the base path of the server the api documentation is on + the resource path.
What actually happens (before this pull request) is that I get a request for
http://localhost:8080/core/api-docs/api/2.0/report/, clearly not what i want!
With this fix, the url is
http://localhost:8080/api/2.0/report/ as expected.

Hope you can understand this, I have to admit the different types of paths confuses me a bit but I'm pretty sure this is the way its supposed to work! :)

[rutchkiwi]

Oh, and I think (not sure though) that this solves issue #84

[gdw2]

I'm having the same problem @rutchkiwi describes and his PR fixes it for me.