(execution): proxy based service call dsl
(chore): reformat javadocs
[maven-release-plugin] prepare release brainslug-0.15
[maven-release-plugin] prepare for next development iteration
(docs): more detailed control flow and basics documentation
(docs): jpa support docs and formatting
(docs): spring support docs, formatting
(readme): add hello world example
(readme): hello world image
(spring, jpa): store error details, integrate with spring lifecycle
(execution): default spring JPA config, WIP