added basic rspec for transport and fix imports in transport class

git-svn-id: https://google-api-ruby-client.googlecode.com/svn/trunk@19 c1d61fac-ed7f-fcc1-18f7-ff78120a04ef

lib/google/api_client/transport/http_transport.rb

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+require 'google/api_client/parser/json_parser'
+
 module Google #:nodoc:
   class APIClient #:nodoc:
       ##