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Add tests for underlayCallback with no series.
Merge branch 'master' of https://github.com/danvk/dygraphs
Fix value of yMax in callback.js test.
Added tests for explicit y axis range in callback.
Merge pull request #229 from clocksmith/master

Fix the bug intorduced from adding ypad and ypadCompat to no longer return NaN values for the yAxisRange. Test added to guarantee that the underlay callback is called even when there are no series and that the yAxisRange is valid.