[SysApps][Android] W3C SysApps Messaging API

The implementation is based on 29 November 2013 editor's draft version
http://www.w3.org/2012/sysapps/messaging/

Completed features list:

Send/receive SMS messages.
Find/list SMS messages
Find/list SMS conversations
Delete SMS messages
Delete SMS conversations
Mark SMS message read status
Mark SMS conversation read status
Feature: https://crosswalk-project.org/jira/browse/XWALK-53