ensemble functionality fixes + log scaling

[alexkjames]

• Added checks to ensure lat and lon are the same across geo series objects passed to ensemblegeoseries
• Added warnings to ensembleseries.from_ageensemblearray in the case that a geoseries object is passed
• Includes changes from #585

Addresses piece of #326

[khider]

Integrated a warning if a GeoSeries is passed: https://github.com/LinkedEarth/Pyleoclim_util/commit/0ea9df6c4f03feef6bd1efb6c8a7891e476a6d80