Strip comments and whitespace from all nodes

Fixes #42
Inspired by https://github.com/Polymer/vulcanize/pull/43#issuecomment-49590122
Bump version to 0.4.1
Update README with --strip functionality

Include updated example outputs

Add example folder

Fixes #54
Fix inline svgs

Workaround for cheeriojs/cheerio#521
Never decode entities

Fixes #52
fixed cheerio options to perform the same parsing while reading and writing