Create a common_srvs package

This package should be VERY simple. It will just contain our common service files so they can be reused across our software.

Make it so this common_srvs can be used across the packages. This will be used to centralize service calls making it easier for us to create custom srv formats.

Read the srvs [docs](http://wiki.ros.org/ROS/Tutorials/CreatingMsgAndSrv)

Good luck.