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Update README header
Remove testing code

Reverts 67c2835d58192b52520055248e78f904cd5f05b3
Use `self` instead of class name
Bump version number to 0.1.5
Merge remote-tracking branch 'remotes/origin/misc-fixes'
Move constants to module level
Some pep8
Update changelog
Add an alias to new_preauthorization_url.

To fix an inconsistency between the docs and the Python client library,
this commit adds an alias method called new_pre_authorization_url.
Refactor as per suggestions
Merge pull request #9 from gocardless/preauth-alias

Add an alias to new_preauthorization_url.
preauth setup_free
dont check if setup_fee is positive, to match the validation in SubscriptionParams
fix tests and bump version to 0.1.6
Merge pull request #10 from pegler/master

setup_fee parameter on new_preauthorization_url
Bump version to 0.2.0
Update changelog
python 2.6 compatability fixes
Merge pull request #11 from pegler/master

python 2.6 compatibility tweaks