Replace lib with node_modules or bower_components

[jamesplease]

We're including some external deps in the repo directly, which prob. isn't necessary with tools like npm and/or bower at our disposal.

I'm not anti-bower or anything, but I think this library might be a case where sticking to npm for simplicity / fewer moving parts could be beneficial.

[ashleygwilliams]

yessssss. p sure this is the next step in the refactor. i'm fine with just using npm. using 2 doesn't really add much value for us, and adds sig complexity for beginners.

i'll probs tackle this in the morning.

[rmurphey]

👍 to just using npm please!

[jamesplease]

Resolved in #112