Add DataArray.epoch.plot() accessor to fix default axes for 2D data when plotting with xarray#107

JoelLucaAdams merged 5 commits intomainepochpic/sdf-xarray:mainfrom

patch_xarray_2d_plotting_defaults_axesepochpic/sdf-xarray:patch_xarray_2d_plotting_defaults_axesCopy head branch name to clipboard