Merge branch 'PMD-solved' into 'master'

.settings/org.eclipse.jdt.core.prefs

conf/quality-config/pmd-ruleset.xml

src/main/java/teetime/framework/AbstractStage.java

src/main/java/teetime/framework/RunnableStage.java

src/main/java/teetime/framework/pipe/InterThreadPipe.java

src/main/java/teetime/framework/pipe/PipeFactoryLoader.java

src/main/java/teetime/util/ListUtil.java

src/main/java/teetime/util/MathUtil.java

...ava/teetime/util/list/CommittableResizableArrayQueue.java

src/main/java/util/test/StatisticsUtil.java