add option for minify and minify name

this commit also change default option.format to false mean assets file will rename to filename.{hash}.ext

file generated should look like this:
    assets.{hash}.min.{css,js}
instead of:
    assets.min.{hash}.{css,js}
v0.2.0

* update docs for new option
* editorconfig: don't trim whitespace for markdown file
* rebuild readme
Merge pull request #14 from roots/develop

v0.2.0