Changed spelling qoute -> quote.
Refactored input type determination and verification.
Moved get_input_type to protected section.
Modified metadata method to ensure that the Ruby hash creation is done only once.
Added file? method.
Changed link to Tika API to get version 3 instead of 2.
Changed available_metadata method to guarantee only 1 calculation.
Renamed metadata vars to _java and _ruby to clarify; public method still named 'metadata', simplified available_metadata.
Merge pull request #3 from keithrbennett/master

Minor Improvements (IMO)