get transport module for Requests

Downloaded just now from
https://gist.githubusercontent.com/chrisguitarguy/2354951/raw/f42f39525e0c1755894a97c0dbfd886b5d31de2b/transport.py
use Requests as XML-RPC transport

Requests supposed checks the HTTPS security certificates.
stdeb package depends on python-requests
download tarballs with Requests
stdeb package depends on python-requests
README: show Travis badge from master branch
Requests-based downloader: set Content-Type header
backport for requests 0.8.2 (shipped with ubuntu 12.04)
use absolute import
fix https
emit warning if certificate cannot be verified
update changelog
Verify SSL certificates when talking to PyPI.

Requires requests >= 0.8.8.
Merge branch 'master' into debian-wheezy

Conflicts:
	.travis.yml
make apt-get install non-interactive