Demands

* Fixes issue with composing url

* HTTPServiceClient invoked with arguments instead of a dictionary
* Enable and match parameters used by `requests`

Before
* `data`, used for both query string and request body
* `verify_ssl`

Now
* `params`: dictionary or bytes to be sent in the query string
* `data`: dictionary, bytes, or file-like object to send in the body
* `verify`: verify the SSL cert

* Save error response content in HTTPServiceError exception

* Switches to requests > 1.0.0

* Adds client identification
* Provides an easier way to modify request arguments in pre_send()

* Initial version