Benchmark tracking

[ceholden]

With efforts underway to speed things up (#70), look into setting up the Airspeed Velocity benchmark tracking tool.

Benchmarks:

• [x] yatsm.algorithms
  • [x] CCDCesque
• [x] yatsm.regression
  • [x] robust_fit.RLM
  • [x] recresid.recresid
• [x] yatsm.phenology
  • [x] longtermmean.LongTermMeanPhenology

Add them to documentation github.io site by copying results from html directory into ouput docs location (see "viewing the results").

[ceholden]

asv needs to support adding conda channels (so we can add the r channel and get rpy2) before we can test longtermmean.LongTermMeanPhenology