Strip as much fireplace code as possible (bug 1001402)

https://bugzilla.mozilla.org/show_bug.cgi?id=1001402

Yogafire doesn't need all of this. I'm not sure we want to do this, and if we do there is more to remove, but this is to kickstart the discussion.

File size comparison:

File  | Old Size | New size
------------- | ------------- | ---------
include.css  | 90K |45K
include.js  | 315K | 229K
package.zip | 545K | 424K