Translated 20a-Geospatial_Spherical-Lecture. Closes #397.
Translated 25a-Python_and_Aggregation_Results-Lecture. Closes #404
Updated according to feedback from @juancarlosfarah
Merge pull request #424 from jcarlosgarcia/issue-404

Translated 25a-Python_and_Aggregation_Results-Lecture. Closes #404
Updated according comments from @jcarlosgarcia and @juancarlosfarah. Refs #397.
Minor edits. Refs #397.
Merge pull request #423 from puentesarrin/issue-397

Translated 20a-Geospatial_Spherical-Lecture. Closes #397.