New method PoolManager._new_pool for customization.
Add default scheme. (Related to #134)
Merge pull request #95 from Bluehorn/master

Please merge trivial change to allow some overrides
Moving private method to the top.
CHANGES.
CHANGES typo.
SSL CHANGES.
Merge remote-tracking branch 'origin/master'
Remove stuff which appears unrelated to this branch.
Not sure where those came from, resp. how they ended up in my branch.