Typo fix + note calling then() multiple times ok

Hat tip Evan Goer and Marco Asbreuk, respectively. I hope I spelled
Marco's name right.
Fix a typo in css section of full source code.

See http://yuilibrary.com/forum/viewtopic.php?p=38789#p38789
Merge pull request #588 from albertosantini/fix-typo-masterdetail-example

Fix a typo in css section of full source code.
Fix a typo in Tree.Sortable's API docs.
Build tree-sortable. Comment changes only.
Updated ScrollView performance test to remove incompatabilities with YUI Benchmark
Added performance.json file for white-listing perf test source files
Merge branch 'master' into dev-master
Added newline
Added newline
Stop modifying people's `options` objects passed to Model's `setAttrs()`

This fixes an issue where people's `options` objects were being modified
by Model's `setAttrs()` method which was adding the `_transaction` to
their object. Now a shallow copy of the `options` object is created
before it is modified.

Fixes #598
Update Model's change history
Correct a Model change history entry
Merge branch 'live-docs' into dev-master
Merge branch 'model-sync-options' into dev-master
Build Model
Build Loader and Seed for Gallery bump
Merge branch 'dev-master' into dev-3.x

Conflicts:
	build/loader-base/loader-base-coverage.js
	build/loader-base/loader-base-min.js
	build/loader/loader-min.js
	build/yui-nodejs/yui-nodejs-min.js
	build/yui/yui-min.js