Revert "Next development version"

This reverts commit b67bb70ee3050a9ecde8bd26915dd7b92a456d60.
Polish POM formatting
Add missing POM info
Remove superfluous <packaging> tags from POMs
Fix broken docs build
Next development version
Do not delete duplicate directories from main classpath

Before this change we were too aggressive in deleting duplicate resources
since directories might not have identical contents, and yet they were
being deleted anyway.

Fixes gh-614
Remove test dependencies from spring-boot-starter-parent

Fixes gh-617