Update impress.js

Fixed typo from "how thing work" to "how things work"
Merge pull request #316 from bijanbwb/patch-1

Fixed typo from "how thing work" to "how things work"
Moves component.json to bower.json

Per the bower README:

> NOTE: In versions of Bower before 0.9.0 the package metadata file was
> called component.json rather than bower.json. This has changed to
> avoid a name clash with another tool. You can still use component.json
> for now but it is deprecated and the automatic fallback is likely to
> be removed in an upcoming release.
Merge pull request #318 from sukima/bower-json-update

renaming component.json to bower.json