Variety of issues and enhancements. 

Features
- Added Credential Storage via storedPrefs
- Added Wiki backing object for persistence across activity. 
- Added auto-detection of created pages on scan to redirect to web page
- Improved layout of elements/async; added smaller thumbnail
- Moved image store to cache
- Reduced compression runs, etc. 


Bugs Fixed
- Bitmap/activity Out of Memory error-bitmap now cached in app.
(recreate by continously rotating display)