Simplify logging#233

Merged

ktoso merged 22 commits intogit-commit-id:masterfrom

autayeu:simplify-logging

Mar 12, 2016

Commits on Dec 30, 2015

first bite of logging refactoring: now logs are in line with standard Maven logging. log message string construction to address.
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Commits on Jan 3, 2016

removed extra property="session"
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enumerated all cases to make adding new mode easier (just in case)
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keep verbose (and others for uniformity) as fields
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switched to ThreadLocalRandom.current() instead of static variable
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switched from AssertException to @Test(expected = IllegalArgumentException.class)
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bridging logging to address Konrad and Michael comments regarding modularization (#92)
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replaced static collection constructors from Google with standard Java ones
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replaced MojoExecutionException with GitCommitIdExecutionException - plugin-specific exception to address Michael comment about modularization (#92)
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adhere to project encoding while reading-writing property files
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