Resolves: Lambda Parallelization - Lambda Function for GroundMotionsToCurves

Resolves #151 (closed)

• New AWS Lambda function to convert a GMM to hazard curve.
• Lambda function takes in the following info:
  • ExceedanceModel exceedanceModel
  • Gmm gmm
  • Imt imt
  • LogicTree<GroundMotion> logicTree
  • double rate
  • double truncationLevel
  • MutableXySequence utilCurve
  • double σScale
• Lambda returns:
  • Imt imt
  • Gmm gmm
  • XySequence curve

For nshmp-haz#489