Rexster Console 2.5.0

This commit adds the rexster console to the list of homebrew formula. It pulls down the 2.5.0 version
from their website and copies over the lib/ and doc/ directories. Since it is a java-based
application everything within the lib/ directory doesn't need built as they are java .jar files. The
rexster script is copied over into the bin/ directory and renamed 'rexster-console' without the
version. Has a simple test to ensure the system works properly by executing the help command.