fix exemple build (std::rand -> crate rand)
Fixed the names of make commands.

This was driving me crazy!
fix to last Rust master
fix build to last master.

- rc -> use deref
- fix examples
more fix
Merge pull request #32 from sinistersnare/master

Fixed the names of make commands.
update to last Rust
- ~[] -> depracted
- use of std::vec_ng::Vec
Merge branch 'master' of github.com:JeremyLetang/rust-sfml
update to last rust
- libextra is remove
- extra::c_vec -> std::c_vec