commits: 7f7b9b346562fd5e5fb10fdde99bbfd67de877ad

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sha	message	author_date	committer_date	raw_author	raw_committer	repo	author	committer
7f7b9b346562fd5e5fb10fdde99bbfd67de877ad	ENH: where method for masking xray objects according to some criteria Fixes GH503 Example usage: In [13]: x = xray.DataArray(np.arange(9).reshape(3, 3), dims=['x', 'y']) In [14]: x.where(x > 4) Out[14]: <xray.DataArray (x: 3, y: 3)> array([[ nan, nan, nan], [ nan, nan, 5.], [ 6., 7., 8.]]) Coordinates: * y (y) int64 0 1 2 * x (x) int64 0 1 2	2015-07-30T21:54:08Z	2015-07-30T21:54:08Z	7ac163783245dbec82e06aac57b56992d3cf2b72	7ac163783245dbec82e06aac57b56992d3cf2b72	13221727	1217238	1217238