drop problematic URL 

fix version number 

Merge pull request #598 from stan-dev/dep-syntac Update more deprecated syntax

comment out TBB stuff 

NEWS: changes for 2.21.1 

just take relative URLs out of vignettes 

release 2.18.2 

prepare to upload to CRAN 

test_stan_nlmer.R: comment out failing test but test loo in glmer.Rmd

test_stan_functions.R: get working on CRAN