Pickling of Session and HTTPAdapter + a test

This is for issue #1088
Merge pull request #1243 from darjus-amzn/master

Pickling of Session and HTTPAdapter + a test
Fixed some pickeling issues with HTTPAdapter and Session

Added trust_env and stream to Session.__attrs__. Initialize
self._pool_connections and self._pool_maxsize in HTTPAdapter.
Merge pull request #1244 from jajadinimueter/master

Fixed further pickeling issues in Session and HTTPAdapter
Add failing test case for #1228
Use session cookies when following redirects

When a redirect was followed, only the cookies set by the initial
response were used in the follow-up request. Fixes #1228.
Do not pass cookies to resolve_redirects

SessionRedirectMixin is extending Session, so we can just use
self.cookies.
Remove duplicate comment.
Merge pull request #1245 from Damgaard/master

Remove duplicate comment.
Merge pull request #1239 from miikka/fix-issue-1228

Use session cookies when following redirects
- Pull credentials out of the URL when possible.
Merge pull request #1254 from jkakar/url-authentication

url-authentication
simplify get_auth_from_url call
get_auth_from_url return None if nothing is found
fix get_auth_from_url
remove makefile
upgrade to charade v1.0.3
invoke!
cp949prover for charade
actually cleanup url authentication