phantomas.tmpdir: generate temporary directory

Generate unique name for each phantomas run using the following schema:

<system temporary directory>/phantomas/<UUID v4>/

Example: /tmp/phantomas/58aea8b5-2c97-48ee-9885-fcd81d38561f/
analyzeCss: get inline CSS nodes
Run analyze-css for inline styles as well (#397)
milestone event: more docs
analyzeCss: analyze inline styles a bit earlier + introduce "cssInlineStyles" metric
cssInlineStyles: add a test case
lib/index.js: beautify
analyzeCss: disable spying when looking for inline styles + add a test
Merge pull request #439 from macbre/analyze-inline-css

Make analyze-css work on embedded styles