Unit tests depend on presence of file outside of repo

[mfrancza]

The hyperloglog unit tests depend on the presence of /usr/share/dict/words (see

BoomFilters/hyperloglog_test.go

Line 34 in 611b3db

dict := "/usr/share/dict/words"

). It would be helpful to include the test data in the repo to ensure the tests work without modification on systems that don't follow that dictionary path convention or don't load a dictionary package.