Add get_pop_obs api#93

Merged

shifucun merged 9 commits intodatacommonsorg:masterfrom

Aug 20, 2019

Commits on Aug 17, 2019

Add get_pop_obs api
Bo Xu
committed

Commits on Aug 18, 2019

Updated comments with more detailed description.
Bo Xu
committed
Update comment and rst file
Bo Xu
committed

Commits on Aug 19, 2019

Updated comments
Bo Xu
committed
Move to populations module
Bo Xu
committed
Add missing change
Bo Xu
committed
Correct typo
Bo Xu
committed
More typo correction
Bo Xu
committed
Add comments on observations field
Bo Xu
committed