manoelcampos/cloudsim-plus: Amazon EC2 Instance Templates and other small features

Added Amazon EC2 instance templates in JSON format (#97). Vm.getStartTime(), Vm.getStopTime() and Vm.getTotalExecutionTime() methods to, respectively: get the time a VM started running for the first time; the time it was destroyed in the last Host it executed; and the total execution time across all Hosts the VM possibly have migrated across (#98). Allow a VM belonging to a broker to be destroyed after all its Cloudlets have finished, independently of the state of other running VMs and according to a given delay (#99). Changed Host Fault Injection Mechanism (#93). Fixed Cloudlets executed with CloudletSchedulerSpaceShared were giving incorrect results (#96)