Merge pull request #25 from Coeuvre/master

Change the mutability of raw pointer
Merge pull request #27 from Coeuvre/master

Change `as i64` to `as FT_Long`
Upgraded to latest Rust + Rust-Empty + Rust-Graphics
Merge pull request #28 from bvssvni/master

Upgraded to latest Rust + Rust-Empty + Rust-Graphics
Building rlib only
Made examples depend on rlib only

Might fix https://github.com/PistonDevelopers/freetype-rs/issues/29
Merge pull request #30 from bvssvni/master

Building rlib only
Added Cargo support to examples
Removed unnecessary lifetime parameters