docs(README): add note about npm install
docs(README): add note about bower install
docs(README): Correct wording on dependencies note
chore(): update checkbox design

Update the checkbox design so it’s closer to the spec. Still needs work
for the animation and theming.
Merge pull request #87 from amweiss/master

docs(README): Correct wording on dependencies note
Demo formatting improvements
fix(toast): be sure to set .delay