Load file for setting analysis parameters
Added TODO
Removed extra line
Refactored saving

- Matches organization of Load and LoadStreaming
- Split Writer class defs from main Save and SaveStreaming objects
Removed stray lines
Added examples for loading data
New binned statistics analysis

- Compute running statistics within each of several bins specified by a
unique key in each streaming batch
- StatCounterArray for keeping track of and updating multiple
StatCounters