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travis-ci

Do not generate atoms / custom metrics formatting (#74)

1. All the names are now transferred as list of binaries, instead of generating atoms at runtime. This is useful for an environment where metrics are built dynamically, preventing the VM from exploding due to atoms not being garbage collected. exometer is perfectly fine accepting lists of terms for metric identifiers.

2. New configuration options:

 - max_messages - allows fine tuning the pobox buffer size
 - formatter - allows injecting a custom metric name formatting function, useful for legacy systems where metrics have already a naming scheme that needs to be preserved.

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