Update to reflect vegan dev version

Implemented new null model functions from vegan dev 2.1-43 and added progress bar
Added progress bar

Added progress bar option to pass to NullMaker
Initial commit

Function implements flowchart from Presley et al 2010 to identify the metacommunity structure as indicated by the metacommunity tests in Metacommunity()
I am dumb
Merge branch 'jslefche-master'