tweak the oculus find module to take copied-in folders
find LibOVR depending on architecure and build type on Linux and Win
simplify the gitignore for interface externals with readme
remove extra spaces in the gitignore
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #2229 from birarda/master

make LibOVR (for oculus) an external dependency