implement FlowComponent.link_to's additional_url_params parameter, which was previously ignored
add missing `.get_absolute_url()` which was swallowed silently
by `git diff` before due to column limits. That's what you get
for trying to create clean pull requests :(
use urlparse instead of string formatting
Merge pull request #7 from laterpay/feature/implement-additional_url_params

implement FlowComponent.link_to's additional_url_params parameter