PTFM-2681: Initial implementation of R API wrappers
Don't print stacktrace when unable to build the requested versions.
PTFM-6086 Fail gracefully when configure/make step fails.
Merge pull request #12 from dnanexus/PTFM-2681-R-API-wrappers

PTFM-2681 R API wrappers
Adding a couple R-specific lines to the .gitignore