added support for overriding recommended packages
quote variables
added outputs
added comment about logging
may need R_HOME and R_INCLUDE environment variables when building packages
need vars.mk
more outputs
can't sync recommended packages ~ rsync not installed on cedar
correction for propagation of r version variable
show arguments
correction to script
change R_HOME to point to /app/vendor/R/lib64/R
apply bug fix from gsl branch from @NebJ
ensure target directories exist
pathing fix
Merge branch 'master' into development

* master:
  sync'd improvements from development branch
  pathing fix
  ensure target directories exist
  apply bug fix from gsl branch from @NebJ
  change R_HOME to point to /app/vendor/R/lib64/R

Conflicts:
	support/build-r
	support/heroku-build
include `no-save` option for test applications
revised build script to include GSL library and several fixes
added build script for heroku and revised others
added test application for GSL