docs: Rewrite of App Fundamentals.. Part 2.
This introduces three new docs:
Services:
Provides an introduction to using services and describes the
service lifecycle (previously in the "Component Lifecycles" section
of the fundamentals.jd document)
Bound Services:
A guide for services that offer binding.
AIDL:
A doc about using AIDL (primarily for creating a service interface)
Also includes edits to IntentService javadocs to clarify
different behaviors for some callback methods
Includes a new version of the services lifecycle diagram
and an additional diagram for determining onRebind()
These files are orphaned for now---they're not linked in the sidenav,
until I get the last couple documents submitted for the app fundamentals.
Change-Id: I7fb0a8faff1f18b7d6b9a7b59f66f55a1b6168f1
