[Activate] inline CSS & JS from local storage

- replaced css with inline style from the local storage
- replaced script with inline js from the local storage
[Activate] inline images from local storage
[Activate] fixes for html imports and execute scripts when loaded

- fix: if src is empty, don't replace with inline
- don't remove src for html imports (Polymer caches in the local storage and other templates use script)
- fixed script to execute when loaded inline
[Activate] added stubs for better unit tests
[Activate] removal html import support

- removed html import support. Polymer uses local storage and other template systems use the script tag.
- added stubs to test the content is working
[Stable] alpha v0.2 - scraps DOM, serializes resources and replaces inline content

- fixed not setting a document in the options
- fixed setting the threading in the options
- updated the readme