Change to unstable version 2.5.4, since the current stable release 2.4.8 does not support libc++ (i.e. OS X Mavericks)

 * Add special handling to fix building on OS X 10.9 Mavericks.
 * The packages ros_warehose and moveit_ros_warehose for which this formula was created build (tested on OS X 10.9).
 * Removed patch which seems to be obsolete.
Merge pull request #13 from NikolausDemmel/fix-mongodb-dev

Change to unstable version 2.5.4