Improve pkg-config error reporting
Merge pull request #210 from gmorenz/master

Improve pkg-config error reporting
Update README for homebrew instructions

Homebrew doesn't contain a glfw3 formula in mainline, it exists in the homebrew/versions tap.
Merge pull request #212 from kballard/patch-1

Update README for homebrew instructions
Fix deprecated Cargo.toml syntax
Use `use foo as bar` syntax
Remove trailing whitespace
Update .travis.yml
Merge pull request #214 from bjz/build-fixes

Build fixes