Created DocItem.

Added database functionality for Documents (sync, load, new, edit, remove, etc).
Updated Login and Register URL's.
Fixed Login return states to match web states.
Implemented Register functionality.
Fixed Register POST parameter bugs.
Added Document IntentService commands.
Fixed 'switch to tab' indexes.
Added Document view in ShowItem activity.
Renamed some Manuals references to Docs.
Added Document operations in Act_Main.
Updated a few strings with extra space after newlines.