first commit
modify readme
Add Object.create fro unsupported browsers.
Add buster.js
Refactor source.
CSS修正
Merge branch 'master' into gh-pages

Conflicts:
	css/main.css
	dist/main.js
	dist/main.min.js
	package.json
	sass/_app.scss
	src/bootstrap.js
	src/services/models/tweet.js
	src/utils/viewhelpers.js
	src/view.js