add latest version of the rodent abundance analysis.
Merge branch 'master' of https://github.com/NCEAS/commdyn

# By Eric Sokol (1) and others
# Via Eric Sokol (1) and saminnh (1)
* 'master' of https://github.com/NCEAS/commdyn:
  Removed unneeded blank lines
  Basic files for calculating the interannual, seasonal and residual variance in climate data with an example using Cedar Creek data. Sort of set up to play not overly meanly with other data, but very much a work in progress. Enjoy!
  further data cleaning: removed rodent removal plots from analysis
  ERS edited fn.divpart.groups.v2.R to include a standardized beta diversity rate (from Chao et al. 2012)