Better embed functionality

Right now, on many sites, bbcode images show the full image, instead of thumbnails. Perhaps setting a static thumbnail, instead of resizing the full image would be a good solution? For example: upon image upload, generate a 300x250 (maybe make the resolution user-changeable in their account settings) jpeg thumbnail, which links to full size image as it does now.

Right now, this line is generating a static size, that is too small:

imagehost/app/Http/Controllers/Image/ViewImagesController.php

Line 75 in 5da3ce5

$image_file->fit(150, 100);

EDIT: It seems thumbnails exist, but are only used for html embed. Maybe add that functionality to BBCode?

Temp fix in #11