improved the algorithm for detecting the best match extended metadata #6466

Job	Run time
Tests (mysql, rails test test/unit)	26m 40s
Tests (mysql, rails test test/functional)	36m 21s
Tests (mysql, rails test test/integration)	17m 41s
Tests (mysql, rspec spec)	3m 26s
Tests (mysql, rake assets:precompile)	3m 46s
Tests (mysql, rake db:setup)	3m 33s
Tests (mysql, rake db:migrate)	3m 10s
Tests (mysql, rake seek:upgrade)	3m 30s
Tests (sqlite3, rails test test/unit)	21m 20s
	1h 59m 27s

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