Fixed authorization request

Fixed the URL and parameteres of authorization request.
Close #20
Vote request tests

Added the tests of VoteRequest.

Closes #4
SaveLinkRequest test

Added the tests of SaveRequestTest.

Closes #5
UnsaveRequest

Added the tests of UnsaveRequest.

Closes #6
HideLinkRequest tests

Added the tests of HideLinkRequest

Closes #7
UnhideRequest tests

Added the tests of UnhideRequest

Closes #8
CommentReplyRequest test

Added the tests of CommentReplyRequest.

Closes #9
SubmitRequest tests

Added the tests of SubmitRequest

Closes #10
Removing LoginRequest

Removed the LoginRequest. The reddit API uses OAuth authetication, this request is not necessary.

Closes #11
MessageRequest tests

Added the tests of MessageRequest.

Closes #12
BaseRedditApiJsonRequest chages

- Some changes in the base class for API requests.
- Added an utility class for tests