Remove gen_sar

This is much more complicated than in previous versions of macroeco
where all distributions were set up to take S and N as the first two
arguments. Without that consistency, it's not trivial to implement gen_sar -
removing for now.
Finish mete_sar and initial unit tests
Ignore egg-info files from local development installs
Add expanded output option to empirical o-ring
Avoid figure parameter pollution in main.py, closes #84
Add faster double-based METE upscaling function based on macroecotools