Add option to plot multiple logos or one

[kevindougherty-noaa]

This addresses issue #131 on EVA. A new option has been added to plot_logos() called single_logo. It is boolean and if True, it will only plot the logo on the final subplot of the figure.

Example figures:

fig.plot_logo(loc='bottom right', single_logo=True, zoom=0.9, alpha=0.2)

fig.plot_logo(loc='bottom right', single_logo=False, zoom=0.9, alpha=0.2)

Please let me know if it would be a better idea to have the options be str such as input="first", input="last", input="all".

[EdwardSafford-NOAA]

This solution is good, though I do like the idea of an input="first", input="last", input="all". That seems a shade more flexible.

[EdwardSafford-NOAA]

Looks good!

[kevindougherty-noaa]

@EdwardSafford-NOAA I agree with you. New commit has the option for more flexibility and will raise error if it is not one of those three inputs. I will attempt to debug the test failures tomorrow.

[CoryMartin-NOAA]

Tests are failing @kevindougherty-noaa , any idea why? I echo, what you both think, it makes it clearer to be more explicit

[CoryMartin-NOAA]

@kevindougherty-noaa is the error related to what was mentioned in EVA about matplotlib version?

[EdwardSafford-NOAA]

Looks good, just had question on the commented lines in the yaml file.