initial commit, pulled the lot from choose_cvds_sites

testing was retarded in that other directory
Merge remote-tracking branch 'origin/master'

add a license file, courtesy github
test passes
testing part is passing R CMD check command

now I need to write the required doc files.

modified:   .gitignore
modified:   R/groupsites.R
modified:   tests/testthat/test_groupsites.R
added rdoc to the code

generated groupsites.R with devtoos::document()
namespace spDists to sp::spDists
remove imports of plyr

I guess I'm not using it right now and travis_cl is whinging
trying to fix the description warnings

license file LICENSE is now referenced in description, properly I hope
stupid bug when only one linked site

close to fixed.  need to work on test
test is fixed.

hwy 2 test case, doesn't have same result with and without wim.  The
problem with wim was that there was only one wim sites, so rowsums
failed because there was only one dimension
bump version
update .gitignore to skip .tar.gz all versions