pydata / xarray / 5388

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ENH: added FacetGrid functionality to line plots (#2107)

* ENH: added FacetGrid functionality to line plots

    a) plot.line can now accept also 'row' and 'col' keywords.
    b) If 'hue' is passed as a keyword to DataArray.plot() it generates
       a line plot FacetGrid.
    c) Line plots are automatically generated if the number of dimensions
       after faceting along row and/or col is one.

* minor formatting issues

* minor formatting issues

* fix kwargs bug

* added tests and refactoring line_legend

* add documentation

* added tests

* minor formatting

* Fix merge. All tests pass now.

144 of 144 new or added lines in 3 files covered. (100.0%)

23859 of 24783 relevant lines covered (96.27%)

8.82 hits per line