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

Merge pull request r-lib#141 from jimhester/testthat_new

Use testthat:::expect

Fix Unicode issues with Windows

Changes to pass R CMD check --as-cran

Merge branch 'master' of github.com:jimhester/lintr

Version 0.3.0.9002