Upgrade to SLF4J 1.7.2
Improve example service client config/logging setup.
Simplify examples, use logback.xml instead of Dropwizard LoggingConfiguration.
Eliminate Maven shading errors from examples.
Merge pull request #137 from shawnsmith/shading

Eliminate Maven shading errors from examples.
Merge pull request #136 from shawnsmith/slf4j

Upgrade SLF4J.  Improve example client config/logging setup.
branch admin -prepare release ostrich-1.5.3
branch admin -prepare for next development iteration
Modify MaxRetriesException to return the last underlying exception.
Logging retriable exceptions at the INFO level.
Whitespace
Polish
Fix all the Log statements to use the (String, Throwable) method.
Merge pull request #140 from milosimpson/retryException2

Modify MaxRetriesException to return the last underlying exception.
branch admin -prepare release ostrich-1.5.4
branch admin -prepare for next development iteration
Update logging statements in ServicePool to not use string concatenation.
Update to use the SLF4J 1.7.x's exception logging mechanism.
Track the cause of exceptions that occur in the middle of execution
Call .toString() instead of .getMessage() in exception logging.