Adds persistence to job site filters; closes #11

Hey Scott, give this a try when you have a chance.

I made it persist your job site choices, but I also made it so that if you uncheck all and refresh it will revert to loading all sites.  There's no real reason to persist the selection of *no job sites* in my opinion. 

Tried to stay true to your styles of syntax and tabbing, let me know what you think!

Cheers