support installing without compiling

Some platforms may not have a compiler, or be appropriate for use with
dtrace-provider. On those environments allow the build to succeed and
rely on the stub implementations instead.

This will squelch all build output, which may be loud and noisey for end
users. If you want to see build output set the environment variable V to
anything.
convert to NAN@1.3.0 for Node 0.8->0.11+ support
added "test" script
0.3.0
handle installs from decoupled npm

Fixes #52 #53
0.3.1