ESSENTIALS-470 Offline third party feature contribution
- added classpath and file support
ESSENTIALS-445 Refactor side-effects out of ping service

- add extra boolean parameter to skip processing (this might need some refactoring later)
ESSENTIALS-445 Refactor side-effects out of ping service

- add extra boolean parameter to skip processing (this might need some refactoring later)
ESSENTIALS-442 Start using tagged versions of the Hippo Theme

- added VERSIONS text file
ESSENTIALS-442 Start using tagged versions of the Hippo Theme

- exclude versions from RAT
ESSENTIALS-484 Robots feature adds incorrect default data
ESSENTIALS-487: Remove unused fields from DependencyRestful and update documentation changes after adjustments to the corresponding .org pages.
ESSENTIALS-487: Remove unused fields "title" and "issuesLink".
extract plugin parsing into utility method
add copyright
ESSENTIALS-445: Extract plugin installation state machine.