Set max width on images within TinyMCE

[jacobobryant]

The grumpycat picture in #14 reminded me that images in the editor are displayed at full width. Better if we make them shrink so they don't overflow on the x axis.

[jeffp42ker]

I've been manually re-sizing images to 800 or 1024 pixel-width prior to upload. I'd be nice to skip that if upload-image could handle that step.

[jacobobryant]

Hm, that should be doable... I've made a second issue for this: #23

[jacobobryant]

(for this issue I'm basically just thinking about setting style="max-width:..." on image elements inside TinyMCE; I'm hoping TinyMCE has an option for that we can flip on)

[jacobobryant]

I went ahead and fixed this because I was writing a post with a bunch of images and it was super annoying, also a quick google search turned up the solution (a one-liner)