Fix build to work on osx
Fix build to work on osx

Fix proguard configuration to work on osx. Also suppress voluminous
proguard warning messages during build.

trask/glowroot,glowroot/glowroot,trask/glowroot,glowroot/glowroot,trask/glowroot,trask/glowroot,glowroot/glowroot,glowroot/glowroot