Introduced the concept of raw ResourceLoader modules

Introduced the concept of raw ResourceLoader modules

This is needed for mobile scripts that are supposed to work on dumb
devices and as such can't rely on client-side RL, but still can take
advantage of server-side minification and concatenation.

Patchset 2: Allow loading raw modules with &raw=true appended to URL.

Change-Id: I9410ffbf6633075e07bd06b10a98a4d12d9b6106