More-webassets

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- Fixes an additional case default filters overriding asset specific filters.
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- Stops default filters from overriding asset specific filters.
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- Adds the ability to define a list of filters (chain) on an asset.
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- Adds the ability chain output filters (i.e. jsx -> jss -> minified).
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- Render the script tag inside the body element instead of after it.

This turns the output into valid HTML. Rendering it outside the body element
as it was done before works in practice, but it is technically not
valid.
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- Add Python 3.5 and make it the default test environment.

- Update to work with Morepath 0.16.

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- Ensures that the webasset_path is always an absolute path.
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