px-compare v1.1.0

px-compare, using headless chrome to capture and compare 100's of polymer components:

• px-compare-create-originals : Run this first on your known 'good' repos, this will create screenshots in a folder called screenshots.
• px-compare-create-changed : Run this after you have made your changes and want togenerate the potentially updated set of screenshots. Puts the results into screenshots-<current-time>.
• px-compare-create-diffs : Compare the control folder 'screenshots' against a given other folder (supplied with the <compare-folder>) argument, e.g. px-compare-create-diffs --compare-folder="screenshot-10:12:30".

• px-compare-create-snapshot : Run this in a single folder to open up the index.html of the repo, capture the screenshot of the page to 'screenshot.png'.

• px-compare : Print this help text.