Adds JS and CSS beautifier defaults.

The settings are all up for debate.

This can't be merged until some outstanding branches with CSS edits are merged.  I think indenting with 4 spaces for JS and CSS is a good thing.  Other than that, I don't have strong feelings.  Edits welcome.  Am opening this pull request in case anyone wants to discuss.
The brace-style is just cargo-culted from https://metacpan.org/pod/Code::TidyAll::Plugin::JSBeautify