Added minimum jQuery UI build info to site

The entire jQuery UI package weighs in at 228k after minifcation. The modules that are required for ember-table are only 55k after min. After digging through the code, it appears that only the following modules are required:

* core
* widgets
* mouse
* resizable
* sortable

So it would probably be helpful to include this info in the docs to avoid users downloading the entire package when it isn't necessary.
enableContentSelection option implemented via classNameBindings
Documentation for enableContentSelection switcher
Simple table example demonstrates selectable text in cells
Merge pull request #89 from davewasmer/patch-1

Added minimum jQuery UI build info to site
Merge pull request #105 from petrvolny/text-selection

Switcher that enables text selection in table cells
Redistribution fixed issue with ember 1.3.0
Redistributed
Merge branch 'redist' of github.com:emberjs-cn/ember-table into redist

Conflicts:
	dist/ember-table.min.js