First cut at a tool to perform automated syncs from Harmony to Dalvik.

Much of the work of the tool is managing three versions of our code:
 - the current Harmony code
 - the current Dalvik code
 - the common ancestor, an older version of Harmony

The tool calls out to the command line to perform the actual filesystem
work. Eventually I'd like to support all of our modules, and also
gathering diffs to send upstream to Harmony.
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