Add batchLimit option
#35
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When running the task against big amount of
.hamlfiles it creates the same amount of async processes. Say, 1000 files spawns 1000rubyprocesses when used with ruby command. That easily consumes all the available machine's memory and fails.This PR adds support of
async.eachLimitfunction which limits the concurrent amount of async processes; andbatchLimitoption to configure it.