Merge pull request #4 from bvssvni/master

Added .travis.yml
Added build status button

Closes https://github.com/PistonDevelopers/fps_counter/issues/3
Fixes deprecation warning for push

Fixes #5
Merge pull request #6 from leonkunert/master

Fixes deprecation warning for push
Added link to how to contribute

See PistonDevelopers/piston#715
time crate moved to rust-lang/time
Point `time` to temporary fork