Pull request for Serenity RPG

Hello! A friend of mine and I were interested in running a Serenity RPG game on roll20 so I thought I would create a character sheet for the system since there doesn't seem to be one yet.

It doesn't have any rolls yet, we were thinking we would play test it a bit and get that all figured out after playing with this initial sheet before adding what we think would be the most helpful.

I hope you guys like this sheet and are willing to incorporate it into your awesome app. Please let me know if there is anything you think should be changed. I used javascript and less to generate the sheet (but only have the resulting output included here - there is nothing but HTML and CSS in here) and the original files can be found in my bitbucket repo at https://bitbucket.org/nmarrero/serenity-char-sheet if you're curious.

Thanks!
Nico Marrero