.travis.yml: Download rustc from rust-lang.org
Updated to latest Rust and updated submodules
Merge pull request #59 from ozkriff/master

.travis.yml: Download rustc from rust-lang.org
Update to the last rust-nightly.
Merge pull request #60 from sebcrozet/master

Update to the last rust-nightly.
Updated for latest Rust
Merge pull request #61 from ozkriff/master

Updated for latest Rust
Updated to latest Rust: ~str -> StrBuf
Merge pull request #62 from ozkriff/master

Updated to latest Rust: ~str -> StrBuf
Updated sax-rs
Updated glfw-rs
Insert .as_slice() where necessary to make gl-rs typecheck
Merge pull request #63 from gmorenz/master

Update to latest rust
Update submodules
StrBuf->String
Merge pull request #64 from bjz/string

StrBuf->String
Updated deps/sax-rs
Updated to latest Rust
Merge pull request #65 from ozkriff/master

Updated to latest Rust
Updated deps/sax-rs and deps/glfw-rs