cleaning up the makefile some, using gnode to run tests
using gnode for node 0.10 backwards compat
Makefile: fix test target
Makefile: Reorder targets

This allows `$ make` to run the tests, which is the only reason we've
got a Makefile to begin with.
Merge pull request #17 from duojs/node_0.10

Using gnode for node 0.10 backwards compatibility