Azure IoT Hub SDK for java Release 2017-01-11

Java Device Client
• Add gson as dependency
• Reorganizing folder structure according to maven standards
• Update version of IoT Hub Java Client library in Android sample
• Set the messageId using messageId property name

Java Service Client
• Reorganizing folder structure according to maven standards

Documentation
• Updated Readme docs, fixed document links
• Update message requirements doc

Maven packages
http://search.maven.org/#artifactdetails%7Ccom.microsoft.azure.sdk.iot%7Ciot-device-client%7C1.0.17%7Cjar
http://search.maven.org/#artifactdetails%7Ccom.microsoft.azure.sdk.iot%7Ciot-service-client%7C1.0.12%7Cjar

merge pull request
#3