Merge pull request #208 from Coeuvre/master

Removed constructor for `GameWindowSettings`
Started working on `GameIterator`
Merge pull request #210 from bvssvni/master

Started working on `GameIterator`
Removed test
Merge pull request #213 from bvssvni/master

Removed test
Fixed bug in iterator

Closes https://github.com/PistonDevelopers/piston/issues/211
Merge pull request #215 from bvssvni/master

Fixed bug in iterator
Upgraded examples to latest Rust

Closes https://github.com/PistonDevelopers/piston/issues/214
Merge pull request #216 from bvssvni/master

Upgraded examples to latest Rust
Removed `Load` from `GameIterator`

Closes https://github.com/PistonDevelopers/piston/issues/217
Merge pull request #218 from bvssvni/master

Removed `Load` from `GameIterator`
Removed `AssetStore` from `GameIterator`

Closes https://github.com/PistonDevelopers/piston/issues/219
Merge pull request #221 from bvssvni/master

Removed `AssetStore` from `GameIterator`
Removed unnecessary lifetimes

Closes https://github.com/PistonDevelopers/piston/issues/222
Merge pull request #223 from bvssvni/master

Removed unnecessary lifetimes
Added width and height to  `RenderArgs`

Closes https://github.com/PistonDevelopers/piston/issues/226
Merge pull request #227 from bvssvni/master

Added width and height to  `RenderArgs`
Removed `context` from `GameIterator`

Closes https://github.com/PistonDevelopers/piston/issues/224
Merge pull request #228 from bvssvni/master

Removed `context` from `GameIterator`
Added `GameIteratorSettings`

Closes https://github.com/PistonDevelopers/piston/issues/229