Upgraded to latest Piston

* Updated examples
* Ignoring Cargo.lock
Merge pull request #38 from bvssvni/master

Upgraded to latest Piston
Merge branch 'master' of https://github.com/PistonDevelopers/freetype-rs

Conflicts:
	examples/single_glyph/single_glyph.rs
	examples/single_glyph_ffi/single_glyph_ffi.rs