kafkaex / kafka_ex / 890

82%

master: 83%

Pull #380

travis-ci

Review binary concat usage

This commit aim to review possible uses of binary concatenation rather
than iolist concat that according with outcomes from issues #231 and #290
had proofed to be more efficient

In the end any other binary concat were found, but some small changes will
be proposed as follows:

1. The Common module was returning a empty string instead empty iolist on
`topic_data([])`, there is not big improvements here but a normalization
among protocol modules

2. Replace literal integer size values to meaningful module attributes
on Produce module

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