v0.2.4

One minor extension:
Added list "projections" to package data store some possible map projection strings.

Two minor bug fixes:

1. in the estMC function if targetSites == SpatialPolygonDataFrame - you get an
   error crs(not identical). However, if the targetSites ==SpatialPolygons - you
   don't get the error. Status: Fixed
2. estMC and estMantel summary statistics don't come out if there are any NAs
   or NaNs in the sample. Status: Fixed

Other minor changes to documentation and verbose settings.