Add icg parser, new API definition

.gitignore

api/InfrastructureTemplateController.py

controller/PluginOrchestrator.py

controller/__init__.py

icgparser/ModelParser.py

icgparser/__init__.py

icgparser/doml/doml.ecore

input_file_generated/ir.json

main.py

output_file_example/wordpress_azure/terraform/main.tf

output_files_generated/nginx_openstack/terraform/main.tf

requirements.txt

templates/terraform/open_stack/virtual_machine.tpl