added comments to composabletechniques.py
added comments to composabletechniques.py

lazyparser/opentuner,Sierangho/opentuner,lazyparser/opentuner,jbosboom/opentuner,Sierangho/opentuner,ucb-sejits/opentuner,jansel/opentuner,phrb/opentuner,lazyparser/opentuner,jbosboom/opentuner,jansel/opentuner,Sierangho/opentuner,ucb-sejits/opentuner,lazyparser/opentuner,Sierangho/opentuner,phrb/opentuner