Bug 960894 - 1/4: allow representing multiple clients in one RIL worker.
Bug 960894 - 2.a/4: move ril_worker init code out of RadioInterfaceLayer ctor.
Bug 960894 - 2.b/4: allow sharing WorkerMessenger between RadioInterface instances.
Bug 960894 - 3.a/4: Move PENDING_NETWORK_TYPE into RIL and rename to pendingNetworkType.
Bug 960894 - 3.b/4: don't modify global.
Bug 960894 - 3.c/4: construct global objects from constructors.
Bug 960894 - 3.d/4: look up foreign objects through 'this.context'.
Bug 960894 - 3.d.2/4: use 'this.context.clientId'
Bug 960894 - 3.d.3/4: use 'this.context.debug'
Bug 960894 - 3.e/4: multiple contexts in one RIL worker.
Bug 960894 - 3.f/4: really merge all RIL worker instances into one.
Bug 960894 - 4/4: fix existing ril_worker test cases.
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