Update alternative java to use java-7-openjdk-i386 version of Java instead of java-6-openjdk-i386.
Updated composer dependencies to get rid of a problem with missing commit'reference is not a tree: b36c613b6acd4624e61c77ee15ada095dcd87b40' on 'Installing gedmo/doctrine-extensions (dev-wip-v2.4.0 b36c613)'.