Updated ElasticsearchWriter to not yield None results
Merge pull request #2 from comperiosearch/yield

Changed to yield based return from processing
Debug print and type fix
Merged
Added target_score to score in TweetAnalyser
Corrected normalization in TweetAnalyser

Dividing by 3 gave a to low score to all items.
Also isolated normalization to the step where it is used to make the intent clearer.
Merge branch 'master' into logging

Conflicts:
	eslib/procs/ElasticsearchWriter.py