Adjustments to contour.py so that levels are set accordingly to input vmin and vmax, if provided, so color bar works correctly.#2176

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kthyng wants to merge 4 commits intomatplotlib:masterfrom

kthyng:colorbar

Commits on Jun 28, 2013

Added lines to _contour_args() to look for vmin/vmax input arguments and then min or max out the input z values accordingly.
kthyng
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Additionally checked for the case when the desired vmax or vmin are outside the range of the data. In this case, the contour plot, if extend for the appropriate direction is also chosen, will appro…
kthyng
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switch calls for vmin and vmax through kwargs in _contour_args() to just call and not pop out the arguments. Turns out it is not necessary to use extend, this will just happen on its own.
kthyng
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Commits on Jun 29, 2013

Added to test_contour.py for colorbar behavior
kthyng
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