Add link flags in order to link statically and without debug symbols
Makefile: added missing -a option
mark command as optional for docker run
docs: mark command as optional for docker run
Merge pull request #801 from dotcloud/build_docker_static

* Makefile: Add link flags in order to link statically and without debug symbols
Merge pull request #975 from unclejack/891-mark_command_as_optional

891 mark command as optional for docker run