Increment version number to 3.1.0

Don't use rprojroot after all

Just implement a depth restriction, so hopefully we don't recurse into
directories with thousands of files.

Use rprojroot rather than built in functions to find the rproj (if th…

…ere is one)

We were running into catastrophic performance taking 20+ minutes on
CRAN's check machines with the previous code, likely because when
searching for Rprojects a parent directory containing thousands of files
was being searched.

I believe using rprojroot should avoid this.

Update link to point to the github version

As the URL checks are generating a false positive for the local link

Update test version

Run globalVariables in a tryCatch

This avoids an error if the package is not installed on the system

Update links in readme

Remove vignettes

Tweak Title to avoid CRAN notes

Do not ignore NEWS.md