Reload at start if necessary

Hi Phillip,

I found your very useful plugin and started experimenting with it. However I found an issue, where no content is loaded, so I fixed it.
Here is the commit comment:

"
If the autoTrigger option is set and the content's height is smaller
than the screen height, then start loading content immediately.

This fixes a bug where you can't scroll because everything fits into the
browser window, so the "scroll" event is never triggered and new content
is never loaded.
"

I hope you're ok with this fix.

regards
Gernot