Update to rust master

Also stop denying all warnings and only deny some common warnings. Allow
warnings such as deprecation.

Closes #634
auto merge of #635 : alexcrichton/cargo/update, r=alexcrichton

Also stop denying all warnings and only deny some common warnings. Allow
warnings such as deprecation.

Closes #634
Allow updating to a precise revision

This commit adds a flag, --precise, to cargo update. This flag is used to update
a dependency to precisely an exact revision (or branch) as part of an update
step. For git repositories the argument is some form of reference, while
registry packages this will be a version number.

The flag --precise forces a non-aggressive update and will fail if the
--aggresive flag is specified.

Closes #484