Stop trying to use mirrors. They don't do anything.
Reflect the fact that paramiko is py3 compatible

Since version 1.13.0 paramiko has python 3 support, update the documentation to reflect that.
Conflicts:
	sites/www/roadmap.rst
Provide correct path to the installing.rst documentation
Don't pin Jinja2 in Travis CI.

Since we're not even running the tests against Python 2.5, I see no reason to force an older version of Jinja2.
Merge branch '1.7' into 1.8
Merge branch '1.8' into 1.9

Conflicts:
	sites/www/roadmap.rst
Merge branch '1.9'
Merge branch 'master' of github.com:fabric/fabric
Add version added for env.effective_roles variable.
Merge branch '1.9'