[Stable] alpha v0.1 - call Offline.prime() to scrap the entire document and save all JS, CSS, IMG & HTML resources to Local Storage

- Offline.prime method works in both the main UI thread and on a worker thread
- added unit tests for with/without worker threads
- added option to run unit tests as live integration tests
- removed unfinished/tested features from Offline
- updated README
[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