improvements to DataType.Date.parse

- return Date object when passed one (fixes #2530058, closes #2530059)
- accept timestamp as number or string
- remove obsolete workaround in validation
Add manual tests for histograms.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of git://github.com/yui/yui3
Merge branch 'master' of git://github.com/yui/yui3
Removed trailing whitespace from charts, graphics and matrix files.
Build for charts, graphics and matrix. No mins changed.
Updated doc comments so that jshint would not throw line to long warnings.
Graphics build files. No mins.
Removed instances in Graphics in which tabs and spaces were mixed.
Graphics build files. No mins.
Addressed comment block warning of line to long in charts.
Charts build files. No mins
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Add ability to set defaultGraphicEngine as query param for charts manual tests.
Initial charts perf tests.
Add more chart perf tests.
Changed charts perf tests helper class generatedataprovider to a static value to avoid fluctuations.
More charts perf tests.