Switched from imagemagick to graphicsmagick.
Fixed the build to use FOR REAL the latest libpng.
Fix in the inclusion of the compiled libpng in the buildpack.
More fixes of the compile step.
Added lib/ to the LD_LIBRARY_PATH.
The shared libraries MUST go in /app not in $BUILD_DIR.
Still more fixes for the $BUILD_DIR problem.
Added zlib 1.2.7.

References #1.
Bumped to latest graphicsmagick, libpng and zlib.
Fixed references to GraphicsMagick in the README.
More README fixes
Vendorized lib. Added libjpeg-turbo.
Downloading libjpeg-turbo and nasm in 'compile' script.
Restored old S3 repo.
Fix PATH in profile.d
Merge pull request #7 from vadims/fix-path

Fix PATH in profile.d