add LICENSE to normalize
update README with license
Removed ScrollView build files for pull request clarity.
Updated HISTORY.md for 3.9.0
Initial commit of Y.Tree and friends.

Imported from the SmugMug Tree gallery module, which has a more
extensive commit history:

https://github.com/smugmug/yui-gallery/tree/master/src/sm-tree
Split labels out into an extension as recommended by @ericf.

Eric pointed out in IRC that labels are a pretty UI-centric metaphor and
probably don't belong in the base Tree and Tree.Node classes, and I agree.

This commit removes the label implementation from those base classes
and moves it into a Y.Tree.Labelable/Y.Tree.Node.Labelable extension.
Changed the formatters to functions returning formatting functions.

Added better handling of empty (nulls/undefined/NaN) values.
Added tests checking for empty values.
Fix incorrectly parsing empty string as 0

Fix the ticket #2533028.
Fix #2533079
Charts unit test updates.
Removed unnecessary meta file.
Merge branch 'dev-3.x' into trac2533079

Merge latest dev-3x into topic branch.
Merge branch 'dev-master' into dev-3.x

Conflicts:
	build/features/features-coverage.js
	build/loader-base/loader-base-coverage.js
	build/loader-base/loader-base-min.js
	build/loader-yui3/loader-yui3-coverage.js
	build/loader/loader-min.js
	build/yui-nodejs/yui-nodejs-min.js
	build/yui/yui-min.js
Added a cleanup method after rendering to de-allocate the formatters.
Fixed the user guide to describe the functions in Formatters.
Merge branch 'fix-2533028' of git://github.com/okuryu/yui3 into okuryu-fix-2533028
Some testing tweaks
Number build
Update AxisBase.getDataByKey to return an object literal with arrays mapped to corresponding data keys when an array of keys is passed as an argument. The method still returns a single array when a key string is passed as an argument. CartesianSeries.setAreaData now has a helper method to allow for extending the class more easily. The setAreaData contains more common functionality while the new helper method (setCoords) contains more implementation specific functionality.
Update series-cartesian-tests to reflect setAreaData's newly created helper method.
Update Handlebars Makefile to prep for Handlebars.js upgrade.