Fixed functionInit, changed version to 2.2.3

functionInit is back at initial behavior, parameters are origin and content (please read https://github.com/iamceege/tooltipster/pull/63).

The version is now 2.2.3. A 2.2.2 tag had been created but was not stated in the file, that's why you may think a version number was skipped.

This version is the last one before the refactoring. For all people who'd like to contribute to the project, please do so from the "dev" branch of the project which is about to be created.