Merge pull request #103 from bvssvni/master

Upgraded
Added cgmath-rs to Makefile

Closes #101
Merge pull request #105 from leonkunert/master

Added cgmath-rs to Makefile
Added -f option to rm

to not throw an error if files don't exist

Update .travis.yml to use the makefile

Updated Makefile
Merge pull request #106 from leonkunert/master

Update .travis.yml and updated makefile
Switch to rust-empty.mk for rust-sdl2
Merge pull request #107 from leonkunert/master

Switch to rust-empty.mk for rust-sdl2
Added rust-portaudio

Updated docs.sh, build.sh, makefile, upgrade.sh and .travis.yml
Merge pull request #111 from leonkunert/master

Added rust-portaudio
Update README.md

Closes #110
Updated piston
Merge pull request #113 from leonkunert/master

Updated piston
Upgraded