show multiple schedules

[paulirish]

from #21:

ability to show multiple different schedules side-by-side or interspersed (i.e. for me, Sunnyvale is the closest stop, but Mountain View has a lot more & faster trains, so I want both printed on one sheet. Or maybe I'd want northbound and southbound on one sheet.)

I like the idea of a "Include nearby stops" checkbox (like hipmunk can do), so that folks like @frenchie16 can easily pick which nearby caltrain station they want to use.

sgtm and something the interactive app would benefit from.

Separately, I think showing both north & soundbound in one view is a bit specific to printing and think you might as well use a separate piece of paper. :)