Fix $.trim() reference, .map() example. Add traversing and Y.bind methods

[juandopazo]

Here are several fixes and additions:

• jQuery.trim() is a property of the jQuery constructor. The example should be $.trim()
• The arbitrary function called in the map example should be preceded by return
• Since the YUI example is doing mapped = Y.all(mapped), the call to get in .map(fn).get() is unnecessary
• I added some traversing methods that were missing: next, prev, parent, children, closest and contains
• I also added .data() methods and the jQuery.proxy equivalence to Y.bind

[rgrove]

Thanks Juan! The YUI changes look good. Will wait for @paulirish to sign off on the jQuery changes.

[paulirish]

LGTM! thx juan!

[juandopazo]

n/p Please fix any poor writing on my part (English is not my native language).