Do not add find_package for packages that contain PkgConfig files.
This allows for easy addition of 3rd party libraries. Basically
libraries providing PkgConfig files will be automatically found
as long as they are declared as a dependency of another package.
Merge pull request #39 from eile/master

Fix c121a79a1da7b43952260fcfa70f4a91619977ea: Ignore packages missing during travis apt-get install
Improve generated FindPackage logic

 1- Use find_package without REQUIRED
 2- If package not found then use pkg_check_modules
 3- If package not found and it was REQUIRED then throw a FATAL ERROR
Merge branch 'master' of https://github.com/julitopower/Buildyard
Close #38: Denoise output a bit, handle missing pkg_config