Rename TimestampsAction.unrecognisedPrecision to logUnrecognisedPrecision
TimestampsAction: remove unnecessary call of response.getWriter()
TimestamperBuildWrapperTest: clear system property before running tests
Split TimestampsReaderTest.testPassThrough into separate test methods
Add TimestamperPaths class to provide file paths to the readers and writers
Upgrade dependencies to latest versions