scaladoc should allow concise mode to be on by default

The HTML that comes out of scaladoc always has concise mode turned off, there should be an option to have it turned on by default. The only way of doing that at present is a hack:

`sed -i -e 's/"__CONCISE_VIEW__",\[!1\]/"__CONCISE_VIEW__",\[1\]/' scripts/scaladoc-scalajs.js`