Normalize whitespaces inside attributes

[maltsev]

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@stevenvachon, thanks for the idea!

[stevenvachon]

Np. It's important to reiterate here that such attributes should be limited to only those containing space-separated lists. We wouldn't want to normalize something literal like:

<tag title="term:  value\nterm1: value">

Something that might help is link-types. I have some more testing to do in order to see if browsers accept characters other than just a regular breaking space.

[maltsev]

For now I only implemented class,rel, and ping minification as collapseAttributeWhitespace module. I'm going to release it in version 0.2.0.

[maltsev]

Released: 0.2.0.