`std::vec_ng` moved to `std::vec` in rust@master

### NOTE: Will not build on Travis Yet ###
You may wish to delay the merge of this PR until the rust nightly PPA is rebuilt. Not sure when that will be.

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Turns out `rust-sdl2` was not happy with my "morningly" rebuild of rustc.
These are some very minor fixes to the imports so that we continue to build against rust@master
Relevant [commit][1] and [pull request][2] on the `mozilla/rust` repo.

Builds on my machine as of:  `rustc 0.10-pre (95ee0a0 2014-03-20 04:36:50 -0700)` ( mozilla/rust@95ee0a0 )

[1]: https://github.com/mozilla/rust/commit/4224147bab87a191cfc935e2e763889c11e63111
[2]: https://github.com/mozilla/rust/pull/13028