Image sizing on mobile widths.

[scottnix]

Need to eventually set it up to save a custom image size at 400px (ish) and scale that down to the current thumbnail width.

Currently it uses a 200x200 image and has to scale it up at some mobilie widths which can look a little distorted, so this should be bumped up a little bit so it doesn't look odd.

Easy to fix, but I don't feel like doing it now, this is a reminder. ;P