Revert "We must references assets using absolute paths"

This reverts commit 1b5ecfa49ea5fa0df217d2ebf55459e3dde97aff.

It was a mistake, we should reference relatively from test.html page
which is the most compatible way to test (server, browser)
Remove unused code around pageHasLoaded
always use fake indexOf

use a function declaration too so that we can use it early
always create a lazyload instance

no need to wrap lzld(). most of the time the standard lazyload()
instance will be used
Default offset 200 -> 333

When offset == 200 we can sometimes see the blank images coming into
view before showing up. 333 should be better

`33` part guaranteed to be completely random

http://xkcd.com/221/