add displayr dirs to .Rbuildignore

[timelyportfolio]

Feel free to dismiss and close since I am not fully aware of context and implications, but would it be possible to add the displayr build, integration, and test directories to .Rbuildignore? I will be happy to submit pull if helpful.

build
examples
tests
theSrc

[JustinCCYap]

Hi Kent, sorry for the late reply. I will raise this with Kyle @kylezeeuwen who will be maintaining this repository.