Fix dependency bug in tsr

github.com/fsouza/go-dockerclient changed `Memory` and `MemorySwap` type from int64 to float64 to avoid "unmarshal complaining". This breaks tsuru's docker provision.

Related commits in go-dockerclient:

* https://github.com/fsouza/go-dockerclient/commit/44038c1
* https://github.com/fsouza/go-dockerclient/commit/5e5b0c4