1D line plot with data on both axes + errorbar plotting added

[kuchaale]

• Closes 1D line plot with data on the x axis #575
• Tests added / passed
• Passes git diff upstream/master **/*py | flake8 --diff
• Fully documented, including whats-new.rst for all changes and api.rst for new API

[shoyer]

I think you're on the right track here, but rather than adding these to the exist _PlotMethods object, I think we would need a new dedicated PlotMethods class for use on Dataset instead of DataArray objects. This could probably involve duplicating some of the existing code to setup the .plot accessor.

[kuchaale]

mwaskom/seaborn#1285

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