This change also deletes generator.go, moving the only interesting line
in it into release.go. The binding has been regenerated with abigen from
develop and solc v0.3.6.
The wrapper code is adapted from the swarm/services/chequebook package
with the following mostly cosmetic changes:
* The code now uses the new Go API interfaces to query balances. Some
minor functional changes were required to make this work.
* The package no longer depends on swarm/services/swap/swap. References
to swap.Promise are replaced by interface{}, the base type of Promise.
This is temporary.
* The contract wrapper has been regenerated with latest abigen
and solc v0.3.6.
* There is a new generator that creates the 'deployed code' variable.
* Documentation comments now follow the recommended godoc style.
* [CHEQUEBOOK] log prefixes are gone.
* LGPL license headers have been added to all files.
