Mangle libuv symbols so libhelium works with node 0.10

Also, update the example script to use one of the public virtual
devices.

Admittedly this is a bit of a hack, but what can you do? To work this needs libuv built with -fPIC so you can link libuv.a into the node shared object. Just 'CFLAGS=" -fPIC" ./configure' for libuv seems to do the trick.