Fixed deprecation warnings.
Merge pull request #167 from leonkunert/master

Fixed deprecation warnings.
Make building work with Mingw

Applied changes by @imbaczek
Improve documentation for `Window` dropping and silence warning
Merge pull request #171 from bjz/docs

Improve documentation for `Window` dropping and silence warning
Use raw-pointer for returning GL proc address
Fix formatting
Update to latest rustc
Merge pull request #172 from bjz/glproc

Use raw-pointer for returning GL proc address
Merge pull request #170 from bvssvni/master

Make building work with Mingw
Added rust-empty.mk

To build with rust-empty, type

`make link && make -f rust-empty.mk`
Added docs about rust-empty to README
Moved rust-empty specific gitignores
Merge pull request #173 from bvssvni/master

Added rust-empty.mk