Reverting the Revert on adf03bc28afcfc09cefe6a387523be6814181d29

Adds the override constants back into the docs
update local filesystem functions with vendor prefix
fixed indentation

included learning resources in: app, sensors, system, context menu, covers

Update docs with links to learning resources

Merge all commits

Reviewed By Jeffrey Heifetz <jheifetz@rim.com>
fixed #444 updated the doc to properly reflect the function call

Reviewed By: Jeffrey Heifetz <jheifetz@rim.com>
Updating localstorage to mention 25MB limit on BB10

Reviewed By: Ken Wallis <kwallis@rim.com>