Significant code rework, including

  * Use `sectionify` to build packages optimized for v1() and v4() generation.
  * Switch to nodeunit for testing
  * Remove performance testing code. (Perf is very unlikely to be an issue in any practical applications.)
  * Remove my really half-assed random number quality test.  Validating RNG quality is a non-trivial problem (e.g. http://csrc.nist.gov/groups/ST/toolkit/rng/index.html)that is out-of-scope of this project.
Merge branch 'v2.0.0' of github.com:broofa/node-uuid into v2.0.0

Conflicts:
	.gitignore
	package.json
	test.js
	uuid-v1.js
	uuid-v4.js
	uuid.js