Changes made for 14.12 release.

Updates for new functionality added in 14.12 release:
-	UDP Transport design
-	TCP vs UDP Transport selection logic at the router
-	mDNS based discovery for the router at the TCL
-	Updates to SLS fetch backoff design to support linear+exponential backoff
-	Router Probing mechanism to detect missing applications
-	Router logic to detect and disconnect slow reader nodes

Other updates:
-	Endpoints usage by AllJoyn Transport
-	TCP Transport data plane architecture and state machine
-	AllJoyn Protocol Version mapping for different releases
-	Link timeout mechanism between routers to detect missing routers

Change-Id: Ifdcb14e0f0dd25fd6cdbc653ec2e7db3fd7939f4
Signed-off-by: Binita Gupta <bgupta@qce.qualcomm.com>
Updated the API guides for About Feature

Since the new About Feature work introduced a new set of APIs
I basically had to rewrite the API guide from scratch using
the new APIs.

We have commited to support the older APIs for at least a year
so we need to keep the older legacy documents around for user
reference. I have renamed the old documents linux-legacy and
android-legacy. I have provided links to the legacy documents
from the new documents and add a link from the TOC to the
legacy documents.

Change-Id: Ib5c7b6a0d8100dd31e4fbad69b095892367ebc1c
Signed-off-by: George Nash <georgen@qce.qualcomm.com>