Merge pull request #284 from bvssvni/master

Fixed Texture
Added how to generate target folder
Removed chapters, added how to build examples
Update tutorial.md
Update tutorial.md
Added link to rust-image docs

Closes https://github.com/PistonDevelopers/piston/issues/286
Added how to render with OpenGL
Added link to tutorial

Closes https://github.com/PistonDevelopers/piston/issues/288
Updated Readme.md to use www.pison.rs.
Merge pull request #289 from leonkunert/master

Updated Readme.md to use www.pison.rs.
Removed Rust-png from the dependecies.
Merge pull request #295 from leonkunert/master

Removed Rust-png from the dependecies.
Updated link with list of games

Closes https://github.com/PistonDevelopers/piston/issues/296
Fixed a bug that can't load sound/music in Game triat
Removed 'Drop' for AudioSDL2

  Because in Game triat, this will cause audio closed before release
  sound/music resources
Added example 'audio'
Merge pull request #298 from Coeuvre/master

Fixed a bug that can't load sound/music in Game triat
Update game_window_glfw.rs
Merge pull request #299 from leonkunert/master

Update to latest Rust
Copied contribution guide to CONTRIBUTING.md