Use the '::callbackMethod' shorthand for defining form callbacks on the same class.
More code-cleanup: Ensure doc comments start with a verb in third person.
Small code cleanup addition.
Changed code to use Utility methods for dealing with combined IDs instead of using IndexInterface::DATASOURCE_ID_SEPARATOR directly.
Removed .travis.yml.
Clean up search_api_entity_update().
Fixed some overlong variable names.
Removed translations from exception messages.
Issue #2252421 by drunken monkey: Adapted class names and namespaces to core standards.