Remove O(n^2) behaviour in weave tagger.
Remove O(n^2) behaviour in weave tagger.

kinvolk/scope,paulbellamy/scope,alban/scope,dilgerma/scope,dilgerma/scope,weaveworks/scope,mbrukman/scope,mbrukman/scope,kinvolk/scope,alban/scope,dilgerma/scope,weaveworks/scope,alban/scope,alban/scope,kinvolk/scope,paulbellamy/scope,weaveworks/scope,weaveworks/scope,dilgerma/scope,alban/scope,weaveworks/scope,dilgerma/scope,mbrukman/scope,mbrukman/scope,paulbellamy/scope,mbrukman/scope,dilgerma/scope,weaveworks/scope,mbrukman/scope,paulbellamy/scope,kinvolk/scope,kinvolk/scope,paulbellamy/scope,alban/scope,kinvolk/scope,paulbellamy/scope