Updated photo functions

Added page_size now that a common download function will handle pagination.
Added a new paginator function

Instead of all the functions that download more than 1 page of results having the same code (that has to be debugged and improved in several different locations), ee_get handles this request across the board by taking an input_fn along with all the other standard arguments.

location: 37.890909, -122.288239
Added option to request only georeferenced data and also the ability to set bounding boxes.
Continuing work on sensors
Merge branch 'vtmeg'