updated to latest rustc
Merge pull request #48 from csherratt/fix_libc

updated to latest rustc
Update examples to the latest Rust
Flatten examples directory
added makefile targets for previous versions
Merge pull request #50 from HeroesGrave/new-make-targets

Added makefile targets for previous versions
Merge pull request #49 from bjz/fix-examples

Update examples to the latest Rust