Don't use scriptaculous loader

Currently we use scriptaculous.js, which loads - builder,effects,dragdrop,controls,slider.

However, we manually include 3 of these files in system-webresources-plugin.xml. The scriptaculous loader does 2 things (which we don't want):

• manually includes the 3 a second time (resulting in 3 more round-trips to the server)
• includes 2 scripts that we don't want (resulting in 2 requests to the server that result in 404s).

We shouldn't include the loader, and just include the files that we want instead.