Fix CoffeeScript test.

These days you need to run the .register() function.
Fix for using Istanbul programmatically.

Use both the '$$cov_*' and istanbul's default '__coverage__' var to see if istanbul is running
Update Travis node versions to ones that work.
Add recursive sandboxing and JSON support.

Closes #11.
Upgrade stack-trace dependency to 0.0.9.
Upgrade dev dependencies.
1.0.0
Stop testing on Node 0.6.

Istanbul, a dev dependency, uses util.deprecate, which doesn't work there.
discover native modules from process.moduleLoadList instead of using a hard-coded list