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