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 into libexec/. Since it is a
java-based application everything within the libexec/lib/ directory doesn't need built as they are
java .jar files. The rexster script is copied over into the libexec/bin/ directory and renamed
'rexster-console' without the version. That same script is then symlinked to the bin/ directory. Last
an 'inreplace' command is used to change the script to look through symlinks that Homebrew creates to
find it's /libexec/lib directory. Has a simple test to ensure the system works properly by executing
the help command.