Annotation processing creation

[rogerhu]

• http://www.slideshare.net/kojilin/annotation-processing-and-code-gen
• http://youtu.be/dOcs-NKK-RA + https://speakerdeck.com/jakewharton/annotation-processing-boilerplate-destruction-square-waterloo-2014
• Testing strategies for validation
• https://speakerdeck.com/rharter/at-eliminate-boilerplate
• https://blog.xmartlabs.com/2016/03/28/Debugging-an-Annotator-Processor-in-your-project/
• https://github.com/square/javapoet/tree/master/src/main/java/com/squareup/javapoet