Rsvp sort and Styling

[dorono]

Hey @pdw207, so this is sorta messy, but I didn't want to merge your fixes to master before I had a chance to get my CSS fixes done, so for better or worse, I pulled down your branch and picked up where you left off, so both of our fixes are in this same PR, and I'm going to close the last one you opened.

I noticed that @InciteDemocracy changed the filter design a bit w/the labels for "Sort by" and location filters being outside the buttons, so we can put that in a future PR, @InciteDemocracy, let us know if you'd like someone to go back and fix that later (or before we push to prod, for that matter, if it's really bugging you).

In summary:

• location filter added by @pdw207
• added click handler to close "sort by" filter popup when clicking outside of the popup
• responsive css updates by me
• unit test update
• misc linting fixes

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[pdw207]

Can you add justify-content: center to .image-and-rsvp-wrapper?

[dorono]

@pdw207 Yeah, I didn't have time to jump on the tests. Did you want to (Squash and) merge this in the meantime and create a new ticket for the test coverage?