some assorted improvements
[Issue tigertext/autocomplete#109] First naïve and untested implementation
[Issue tigertext/autocomplete#109] First Tested Version, still not benchmarked, but promising
[Issue tigertext/autocomplete#109] 100% Coverage
Update rebar.config
[Issue tigertext/autocomplete#109] Benchmarking too
Merge pull request #30 from inaka/elbrujohalcon.filters

Issue tigertext/autocomplete#109: Now you can "filter" your queries using cache