Add unchecked access to vector components on the Indexable trait.
Update to the last Rust.

This renames lib.rs to nalgebra.rs so that the generated *.so has the right name.
Fix pkgid.
Use new std::vec functions
Merge pull request #2 from jhasse/patch-vec

Use new std::vec functions
Update to the last Rust: pkgid -> crate_id
Update to the last Rust.