Fix date tests

Fixes the test case to pass the tests in your own environment. Cause is
probably the difference of time zone, the tests should pass independently
of the environment.
Fix expected value
Update tests to avoid API testing with using API
Remove unuse variable
Improved tests to the detection of AM and PM that it does not depend on the API
Promise examples
Tweaks to examples

Use an error object as rejection reason in the Github example
Show how to use the PromisePlugin before listing the full code
Revert some changes to index.mustache
Adding missing tags back
Merge branch 'live-docs' of git://github.com/juandopazo/yui3 into juandopazo-live-docs
Adjust Promise's component.json data and whitespace
Fix typos and whitespace in Promises user guide and examples
Add ability to filter log messages by threshold

This allows configuration of a minimum log level. Log messages greater than
or equal to the specific log level will be included in the log output,
others will be discarded.
Merge pull request #5 from ericf/juandopazo-live-docs

Some fixes for Promise's user guide and examples
Add newlines at EOF, remove type attribute
Show table of contents
Capitalize titles and add missing links
Use node.set('text', text) instead of innerHTML
Fix #583. Allow upper and lowercase `to` values for `convert()`. Also return original value if an invalid `to` value is provided.
Incorporate @ericf's feedback

- Show markup and CSS in GutHub cache example
- Use Y.Lang.sub and Y.Escape.html
- Missing / in URL