Fixes Issue #129

Not ideal, but effectively reverts the default behaviour of the library to how 0.9.8 worked,
that is it passes the access_token as a query parameter to the server.

To allow the utility 'get' method to use an Authorization header *instead* then you need to
explicitly enable this behaviour by using the method :

  var oa= new Oauth(...);
  oa.useAuthorizationHeaderforGET(true)

Note this can/should be used in conjunction with the other utility method:

  oa.setAuthMethod(...)

The default value for the Authorization header is 'Bearer'

If you're building your own requests using oa._request then there is a new exported
method:

  oa.buildAuthHeader(token)