mqttinputdstream for mqttstreaming adapter
added mqtt adapter
added mqtt adapter library dependencies
added mqtt adapter wordcount example
add maven dependencies for mqtt
add maven dependencies for mqtt
remove unused dependency
remove unused dependency
modify code, use Spark Logging Class
Update MQTTInputDStream.scala
Update MQTTWordCount.scala
Show "GETTING_RESULTS" state in UI.

This commit adds a set of calls using the SparkListener interface
that indicate when a task is remotely fetching results, so that
we can display this (potentially time-consuming) phase of execution
to users through the UI.
Update MQTTWordCount.scala
Update MQTTWordCount.scala
Shorten GETTING_RESULT to GET_RESULT
Merge pull request #64 from prabeesh/master

MQTT Adapter for Spark Streaming

MQTT is a machine-to-machine (M2M)/Internet of Things connectivity protocol.
It was designed as an extremely lightweight publish/subscribe messaging transport. You may read more about it here http://mqtt.org/

Message Queue Telemetry Transport (MQTT) is an open message protocol for M2M communications. It enables the transfer of telemetry-style data in the form of messages from devices like sensors and actuators, to mobile phones, embedded systems on vehicles, or laptops and full scale computers.

The protocol was invented by Andy Stanford-Clark of IBM, and Arlen Nipper of Cirrus Link Solutions

This protocol enables a publish/subscribe messaging model in an extremely lightweight way. It is useful for connections with remote locations where line of code and network bandwidth is a constraint.

MQTT is one of the widely used protocol for 'Internet of Things'. This protocol is getting much attraction as anything and everything is getting connected to internet and they all produce data. Researchers and companies predict some 25 billion devices will be connected to the internet by 2015.

Plugin/Support for MQTT is available in popular MQs like RabbitMQ, ActiveMQ etc.

Support for MQTT in Spark will help people with Internet of Things (IoT) projects to use Spark Streaming for their real time data processing needs (from sensors and other embedded devices etc).
Fix Maven build to use MQTT repository
Merge remote-tracking branch 'upstream/master' into ui_new_state

Conflicts:
	core/src/test/scala/org/apache/spark/scheduler/SparkListenerSuite.scala
Add unpersist() to JavaDoubleRDD and JavaPairRDD.

Also add support for new optional `blocking` argument.
Fixed broken tests