Updated quickstart.xml for new versions of OS X and Cassandra, and added instructions to start from a fresh install of OS X.
Fixed bug in sample application Counter (extending Updater). Line 369 now uses the local logger and casts the Slate name to a string; previous version used System.err and directly used the byte array updatedSlate.
Merge pull request #46 from arobb/master

Updated quickstart.xml for new component versions and add'l instructions