Merge tag '1.0.0' into develop

1.0.0
* dimensions are now longer calculated for `url` values,
  [`width`, `height` and `size` functions][1] do this instead;
* dimensions can be corrected for high density images;
* files aren't inlined depending on file size anymore,
  use [`inline` function][2] to do it manually instead;
* `inline` option is removed;
* all modifiers are removed;
[1]: https://github.com/borodean/postcss-assets#image-dimensions
[2]: https://github.com/borodean/postcss-assets#inlining-files
Issue in Readme with `gulp-postcss`
Merge pull request #4 from pascalduez/develop

Issue in Readme with `gulp-postcss`
Implement cachebuster
Update the README.md cachebuster instructions
Merge branch 'feature/cachebuster' into develop
Remove `console.log`
Bump the version
Merge branch 'release/1.1.0'