Bug 531786 - [Tips] Add Json provider

Adds a Json provider that can loads tips from a remote or local Json
file.

Added about.html

Change-Id: I06c67c42bc0a7fc38af06f622af82305b7cbb169
Signed-off-by: Wim Jongman <wim.jongman@remainsoftware.com>
19 files changed