Update checkpoints.
Merge pull request #36 from grokouser/ubuntuReadmeUpdate

Added QT build section to README_ubuntu.txt
Merge pull request #37 from grokouser/getBalanceFix

A fix for getbalance "account"
Merge pull request #34 from grokouser/POSperformance

Performance boost to POS mining
Merge pull request #39 from yacoin/master

Latest changes to testing.
Merge remote branch 'yacoin/testing' into testing