Get more build information (works with DeployGate 1.7.0+)

• No DeployGate#install(this) is required anymore!
• Added following new functions/getters works with DeployGate 1.7.0+:
  • getDeployGateVersionCode()
  • getCurrentRevision()
  • hasUpdate()
  • getUpdateRevision()
  • getUpdateVersionCode()
  • getUpdateVersionName()
  • getUpdateMessage()
  • installUpdate()
  • getDistributionId()
  • getDistributionUrl()
  • getDistributionTitle()
  • openComments()
  • composeComment(String)