Move asXml/asParams/asParamMap/asToken to be Http.read methods

Enables req.asHeadersAndParse(Http.readParamMap), so that the asParamMap
functionality is available when requesting code/headers.
Merge pull request #22 from pfhayes/dev

Move asXml/asParams/asParamMap/asToken to be Http.read methods
test against google
bumped version to 0.3.8
only need one 2.10 version
travis ci
triggering a build