Expose _serialize as stringify, for consistency with Y.QueryString
modify api so Y.IO.stringify('#my-form') works
improve argument names and docs
fix typo
make options optional
avoid Y.Lang
clarify code
Stubbed-in some io-form serialization tests.
Merge pull request #1 from ericf/io-serialize

Stubbed-in some io-form serialization tests.
unit tests for Y.IO.stringify
Merge branch 'y-io-serialize' of git://github.com/jafl/yui3 into jafl-y-io-serialize
Merge branch 'jafl-y-io-serialize' into dev-master
Merge branch 'dev-master' into dev-3.x