refactor find modules so they complain when things are missing
Merge pull request #307 from birarda/master

refactor modules so they actually bail when things are missing
Merge branch 'master' of https://github.com/worklist/hifi
fix old reference to LODEPNG_LIBRARY
Merge pull request #308 from birarda/master

fix broken reference to LODEPNG_LIBRARY
Merge branch 'master' of https://github.com/worklist/hifi