Add HyperLogLog library
Modify hyperloglog:add() to return if the estimate was altered or not.
Fix the hyperloglog:count() return type in the documentation.
Merge pull request #32 from mozilla-services/hyperloglog

Add a HyperLogLog library
Fix the Windows build and test

Tested Lua 5.1.5 mingw/VS2013 32/64 bit
Merge pull request #33 from mozilla-services/windows_fixes

Fix the Windows build and test
Merge remote-tracking branch 'upstream/dev' into haproxy-grammar