Allow fallback URLs for BIP72 payment request fetching. Adds unit tests.
Fix KeyChainGroup.toString double keys output
Work done can never be negative. Assert for that fact, because we've seen negative values in the wild.
Create a lightly optimised, dedicated JAR for wallet-tool instead of the oddly named bitcoinj-tools-0.12.jar
Add some junk to the POM to create a dedicated bundled JAR for the pull tester.