Update Docker to 1.3.3

1.3.3 is a security update, addressing two CVEs:

[CVE-2014-9356] Path traversal during processing of absolute symlinks
[CVE-2014-9357] Escalation of privileges during decompression of LZMA
(.xz) archives
[CVE-2014-9358] Path traversal and spoofing opportunities presented through
image identifiers

Man pages, the SystemD socket initialization, and shell completion scripts
have also been updated accordingly.