Fixes #20 by exposing the initial http.Request on the session

[mweibel]

Fixes #20

[coveralls]

Coverage increased (+0.04%) to 94.43% when pulling 64b59d7 on mweibel:feature/20-expose-http-request into 50b75e1 on igm:v2.

[fatih]

Btw this broke our sockjs client which was using the session interface:

https://travis-ci.org/koding/kite/jobs/62776474

Here is the sockjsclient implementation: https://github.com/koding/kite/tree/master/sockjsclient

Because there is a new method, the clients are not compiling anymore because they do not satisfy the sockjs.Session interface anymore.

I thought the point of using gopkg.in was to avoid such things. This PR is definitely something that breaks the exposed interface. So it should be released under the version v3.

[igm]

I'm sorry @fatih , I'll revert this merge. I should have thought about this more carefully. Interface change is definitely an API change.

[igm]

Just to add, the revert happened in "v2" branch only, so that the change remains in "dev" version in "master" branch. In order to use "dev" make sure to import "github.com/igm/sockjs-go/sockjs".

[fatih]

Thanks @igm for the change.

[mweibel]

sorry @fatih @igm - not yet fully used to the golang way ;) -- @igm is there anything I'd need to do still or all ok?