Apply image path manifest changes to script.

Changes to content URI patterns:
- spelling and case variations (jpg/JPG/jpeg/JPEG).
- narrow to album directories

Update window address with current image URL,enabling continuation after tab is unloaded.

Changed behavior in 0.1.5 from 0.1.4:
- Must explicitly unpause, or set option allowAutoStart: true. Will not begin playing after doing next/previous.
- Tapping middle toggles pause
- Other refinements around state

Repackaged without extraneous properties in manifest.json