Various: Minor fixes

- Date: Drop unneeded check for number type on Globalize.format();
- Date: Fix main API comments;
- Gruntfile: simplify uglify configuration;
- README: minor content update;
- Test: Remove trailing line on test/unit;
- UMD wrapper: remove unused root from intro.extend.js;
Various: Use registry name cldr.js

Use registry name cldr.js instead of github url rxaviers/cldr.
This change applies to both npm and bower.
Various: Update cldr.js dependency to 0.3.0
Gruntfile: Split jshint:grunt:source:test

Apparently, the joint form doesn't work.