Initial interface design
All metric producers share the same metric manager
Basic metrics gathering implementation
Measurements are terminated when the LogWatch is terminated
Don't forget to increment messageCount

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Test for DefaultMessageMetric
Test the message metric manager
Metrics can now be handed down from LogWatch to Follower
Tests for handing down
Implemented waiting for a particular metric state
Don't override versions in child POMs
Add tests for metric waiting
Merge pull request #33 from triceo/GH-23

Issue #23: Message metrics