Github changed its base CDN address.
Honor $JAVA_OPTS when calling java.
Honor $JAVA_OPTS when calling java.
Merge branch 'master' of github.com:danielegozzi/juicer

Conflicts:
	lib/juicer/install/yui_compressor_installer.rb
Avoid to spawn a shell with IO.popen().
Merge pull request #77 from danielegozzi/master

Passing options to the JVM