…lder

I'll contribute this in a later pull request

…nges due to bitcoinj 13

- As per mrosseel's pom file, conversion of all dependencies to use maven2. This will ease the pain of managing a bunch of jar files in lib
- Repaired some deprecation warnings in bitcoinj dependency around Sha256 creation and ECKey construction.
- Adjusted test harness to create tokens for pos/merchant facade, this is done once the first time someone runs the tests. The test runner just has to pair with their test account. The tester is does not have cascading test failures that might confuses as to what he/she needs to do.
- Added some notes about how to do the refund test.

- Added constructors for passing the URI of your private key. We prefer to have users of this library pass in a URI for their key file. That way, this api isn't just writing new key files to the current working directory. If the URI does not have a key already, one will be created there (if writeable). It will be the user's responsibility to safeguard their private keys.
- A bit of code cleanup in terms of spelling and removal of warnings, etc.