Move invalid alias declarations, which cause HTML highlighting to fail

The alias declarations in prism-javascript.js and prism-css.js are in
the wrong place and must be moved inside of the pattern object.
Otherwise they get injected into the markup grammar. The execution
fails, because the alias is a string and not a RegExp.
Merge pull request #395 from zeitgeist87/gh-pages

Remove invalid alias declarations, which cause HTML highlighting to fail