Use ServiceLoader for yaml

[SentryMan]

now people can plug their own yaml parsers.
fixes part of #41

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[SentryMan]

hmm

[SentryMan]

perhaps I've become too comfortable with circles(this time I just didn't feel like rewriting all the tests). But this'll work to extract the yml out of the config module so it can be excluded via maven.

[rob-bygrave]

I don't think this change is justified. The premise is the YamlSimpleLoader is large enough to justify removing it out into a separate module.

It's 300 lines, I don't think this justifies pulling it out into a separate module etc.

[SentryMan]

It saves like 10kb if we take it out yeah