httpbakery: add Service; unexport other types
bakery/example: update for new httpbakery API
httpbakery: start of Do implementation
fix some bugs; it seems to be working up to a point...
gofmt
more bug fixes; we can actually acquire a discharge macaroon now, woo!
first successful example run!
remove TODO items
Merge branch 'master' of github.com:rogpeppe/macaroon into 006-remove-TODOs
update README.md
Merge pull request #7 from rogpeppe/006-remove-TODOs

remove TODOs
Merge branch 'master' of github.com:rogpeppe/macaroon into bakery
improve doc comments