Response and Request objects are pickleable.

Includes a basic test. More could be add to confirm known attributes
that could cause problems.
Wheel support.
Add wheel to dev requirements.
loosen URL handling for non-native URL schemes
Merge pull request #1717 from jvantuyl/master

loosen URL handling for non-native URL schemes
Merge pull request #1735 from Lukasa/wheel

Wheel
add coverage make target
Merge pull request #1739 from pengfei-xue/devel

add coverage make target
Add target to build the documentation
wording
Small fix broken cookie parse
issue #1746 : Don't lowercase the whole URL!
use geturl to lower scheme
Merge pull request #1745 from nonm/master

Small fix broken cookie parse
Merge pull request #1733 from ionrock/pickleable-responses

Response and Request objects are pickleable.
Merge pull request #1742 from kevinburke/docs

Add make target to build the documentation
Merge pull request #1747 from daftshady/lowercase

#1746 don't lowercase the whole url