v8: S3 permission changes and other improvements

Merge pull request #40 from uhinze/master

Mask password and refactor Cloudformation template

v7.1: Fix for improve modernized Lambda implementation

#29

v6.1: Run and compile older version with Java 8

Allows to run the workshop with Java 8 before #26 was applied.

v7: Improve modernized Lambda implementation, initial automation for Refactor Spaces

detailed description for improvements of the Lambda implementation can be found in #26

v6: Merge pull request #24 from deki/config-url-replacement

replace target URL in config so that app can be used rightaway