[ssl][paypal-ec] fix security hole in ssl protocl for paypal site.
fix consstant CURL_SSLVERSION_TLSv1 does not exists.
[request] add cancel request.
[request] allow get raw content of the request.
Merge pull request #246 from formapro-forks/request-get-htt-request-allow-get-raw-content

[request] allow get raw content of the request.
Merge branch '0.12'