Framework: Use standalone shallowequal instead of react/lib's

[ockham]

In preparation for React 0.14, cf #776 #786 #787 and friends.

To test:
Make sure the Reader still works.

CC @blowery @aduth

[aduth]

Tests well for me 👍 (Specifically, changing lists in the Reader)

Two points to make:

• All new dependencies should be added to CREDITS.md, per contribution guidelines
• On a few occasions, I've been tempted to bring in Dan Abramov's react-pure-render helpers, which include a shallowEqual utility. We could eliminate the extra dependency if we were to use only this module instead. That said, I've not yet had a need for the helpers, so maybe this is a bit too preemptive 😄

[ockham]

Two points to make:

• All new dependencies should be added to CREDITS.md, per contribution guidelines

Uh right, I keep forgetting. Added & squashed.

• On a few occasions, I've been tempted to bring in Dan Abramov's react-pure-render helpers, which include a shallowEqual utility. We could eliminate the extra dependency if we were to use only this module instead. That said, I've not yet had a need for the helpers, so maybe this is a bit too preemptive 😄

Yeah, shallowequal docs says it was actually taken from that library (instead of directly from React). I was considering using react-pure-render's, too, but came to the same YAGNI conclusion (even if we actually might need it at some point, I don't think there's much sense in adding it already). We just need to remember to remove the shallowequal dependency whenever we add react-pure-render.

[aduth]

In that case, I think this is good to go 👍