Shade commons io

[bsideup]

Master fails with (as reported by @barrycommins):

java.lang.NoClassDefFoundError: org/apache/commons/io/output/TeeOutputStream

    at org.testcontainers.containers.LocalDockerCompose.invoke(DockerComposeContainer.java:515)
    at org.testcontainers.containers.DockerComposeContainer.runWithCompose(DockerComposeContainer.java:153)
    at org.testcontainers.containers.DockerComposeContainer.finished(DockerComposeContainer.java:205)
    at org.testcontainers.containers.FailureDetectingExternalResource$1.evaluate(FailureDetectingExternalResource.java:36)
    at org.testcontainers.containers.FailureDetectingExternalResource$1.evaluate(FailureDetectingExternalResource.java:30)
    at org.junit.rules.RunRules.evaluate(RunRules.java:20)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.output.TeeOutputStream
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 12 more

It seems that we shade zt-exec but not commons-io (transitive dependency)