chore(tooling): let onPrepare inject h264
chore(tooling): let onPrepare inject h264

tran2/spark-js-sdk,aimeex3/spark-js-sdk,adamweeks/spark-js-sdk,mwegman/spark-js-sdk,urbenlegend/spark-js-sdk,bbender/spark-js-sdk,mwegman/spark-js-sdk,tran2/spark-js-sdk,adamweeks/spark-js-sdk,urbenlegend/spark-js-sdk,bbender/spark-js-sdk,aimeex3/spark-js-sdk,adamweeks/spark-js-sdk,ciscospark/spark-js-sdk,aimeex3/spark-js-sdk,bbender/spark-js-sdk,mwegman/spark-js-sdk,ciscospark/spark-js-sdk