Update make deb for the GF 3.10 release

This includes adding commands in debian/rules to build and include
the RGL and the example grammars in the debian package.

Makefile

@@ -33,7 +33,7 @@ html::
 # number to the top of debian/changelog.
 # (Tested on Ubuntu 15.04. You need to install dpkg-dev & debhelper.)
 deb:
-	dpkg-buildpackage -b
+	dpkg-buildpackage -b -uc
 
 # Make an OS X Installer package
 pkg: