Bump version to v0.11.0

Test binaries and packages uploaded to:
```bash
Ubuntu/Debian install script: curl -sLS https://test.docker.io/ | sh
Linux 64bit binary: https://test.docker.io/builds/Linux/x86_64/docker-0.11.0
Darwin/OSX 64bit client binary: https://test.docker.io/builds/Darwin/x86_64/docker-0.11.0
Darwin/OSX 32bit client binary: https://test.docker.io/builds/Darwin/i386/docker-0.11.0
Linux 64bit tgz: https://test.docker.io/builds/Linux/x86_64/docker-0.11.0.tgz
```