Minor fixes.
More refactoring/simplification.
Removed unused variable.
Updated Summon dependency.
Implemented Summon query expansion.
- Resolves VUFIND-929.
Refactored Wikipedia logic to separate class.
More refactoring for readability.
Upgraded Zend Framework.
Added missing comment.
Updated dependency.
Implemented RetrieveBatchInterface for Summon search backend.
- Resolves VUFIND-931.
Shortened comment.
Updated dependencies.
Added Summon Topic Explorer support.
- Resolves VUFIND-930.