Added Number#clz
Merge pull request #20 from jussi-kalliokoski/master

Number#clz
Merge pull request #18 from hemanth/master

-0 is an IEEE754 binary double precision value, just as +0 is. It has negative sign.
Revert pull request #18.
Add more Number and Object functions.

Added:

* Number.MAX_INTEGER
* Number.EPSILON
* Number.parseInt
* Number.parseFloat
* Object.isObject
Release 0.5.0.
Add links to es6 spec drafts and harmony proposals.
Bump es6-collections info.
Follow Map implementation from Spidermonkey instead of V8.
Update mocha and expect.js.
Release 0.5.1.
Remove String#toArray and Object#isObject as per update.
Switch from expect.js to chai, update browser mocha.
Release 0.5.2.
Add license to js file.
Improve String#repeat performance by ten-fold. `new Array` suck.
Comment style fixes.
Use short test syntax.
Import str tests from mozilla-central.
Remove trailing whitespace.