Adjusted require_tree directives for scripts and stylesheets

Heroku is not liking the application's javascripts. They must be manually added, and often one file mucks up the rest of the application. Removing require_tree directives and individually requiring chosen scripts to avoid future conflicts.

Combining stylesheets into a require_tree directive, as this makes the file clearer, and so far there are no signs that Heroku will balk at this.
Testing production config for assets on Heroku

Set config.serve_static_assets = true
and config.assets.compile = true