v2.3.1

Uses sparse matrix for two-paths lookup matrix for more efficient and scalable change statistic computation.
Add bipariteGoFfixedMode to stochastic approximation estimation so that for bipartite networks, can fix either mode A or B nodes if the outcome variable is not defined for that mode.
Improvements to output formatting for stochastic approximation estimations.
More regression tests, including for bipartite change statistics.
Includes R scripts to load, merge, convert, and get centrality scores for director interlock data.
Fix bug in changeo_Ob and contagion with NA_VALUE.
Rename files/functions from simpleDemo to estimateALAAM etc. and update comments etc.
Added changeBipartiteEgoThreeStar change statistic.
Added bipartite Goodness-of-Fit example.

Full Changelog: v2.3...v2.3.1