[Research] Split CloudFormation template file into multiple files

[rubenhorn]

Use the cfn-include preprocessor to combine several smaller template files into the final template file to be deployed.
(Similar to #98)

This requires NodeJS.
I we actually end up using this, we might want to look into using NodeJS/NPM for other things as well, such as porting scripts to NodeJS and also using it for other automation tasks/tools (see #91)