Removed mismatched comment.
Factored WorldCat query building to its own class (first step toward new backend).
Removing NAF harvest tool; the API this depends on is broken and will not be fixed.

Authority data can now be conveniently downloaded directly from OCLC:

http://www.oclc.org/research/activities/fast/download.html
http://viaf.org/viaf/data/
Removed outdated references to install.bat.
Merge branch 'master' into search-refactor
Removed unnecessarily overcomplicated debugNeeded() mechanism.
Merge branch 'master' into search-refactor
Removed unnecessary use statements.
Fixed comments.
Corrected comment.
Moved getSearchService() up to Base results for sharing with other search classes.
Added method to retrieve a backend.
Code simplification.
Refactored WorldCat search to use new search subsystem.
Created AbstractRecordCollection class for generic shared behavior.
Merge branch 'master' into search-refactor