CRAN gotchas

This is a collection of CRAN gotchas that are worth avoiding at the outset.

• Make sure your package title is in Title Case.
• Do not put a period on the end of your title
• Avoid starting the description with the package name or This package ...
• Make sure you include links to websites if you wrap a web API, scrape data from a site, etc. in the Description field of your DESCRIPTION file
• Avoid long running tests and examples. Consider testthat::skip_on_cran in tests to skip things that take a long time but still test them locally and on Travis.