Patch Set 2: I would prefer that you didn't submit this; Unclean IP, do not check in

good work ! but still some way to go

This change needs a CQ hence marked unclean IP

the test IgnoreCacheTest.testExclude fails
junit.framework.AssertionFailedError: expected:<3> but was:<0>
	at junit.framework.Assert.fail(Assert.java:47)
	at junit.framework.Assert.failNotEquals(Assert.java:280)
	at junit.framework.Assert.assertEquals(Assert.java:64)
	at junit.framework.Assert.assertEquals(Assert.java:198)
	at junit.framework.Assert.assertEquals(Assert.java:204)
	at org.eclipse.jgit.ignore.IgnoreCacheTest.testExclude(IgnoreCacheTest.java:149)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at junit.framework.TestCase.runTest(TestCase.java:164)
	at junit.framework.TestCase.runBare(TestCase.java:130)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:120)
	at junit.framework.TestSuite.runTest(TestSuite.java:230)
	at junit.framework.TestSuite.run(TestSuite.java:225)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

the test IgnoreCacheTest.testPriorities fails
junit.framework.AssertionFailedError: Excludes file was not initialized
	at junit.framework.Assert.fail(Assert.java:47)
	at junit.framework.Assert.assertTrue(Assert.java:20)
	at junit.framework.Assert.assertNotNull(Assert.java:217)
	at org.eclipse.jgit.ignore.IgnoreCacheTest.testPriorities(IgnoreCacheTest.java:180)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at junit.framework.TestCase.runTest(TestCase.java:164)
	at junit.framework.TestCase.runBare(TestCase.java:130)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:120)
	at junit.framework.TestSuite.runTest(TestSuite.java:230)
	at junit.framework.TestSuite.run(TestSuite.java:225)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Test coverage could be improved:
- IgnoreRule: get methods
- IgnoreNode: parse methods, isIgnored, wasMatched
- SimpleIgnoreCache: fullyInitialize, readIgnoreRules,
     addIgnoreNode when (ignoreMap.get(directory) != null)
     getParent when return value isn't empty string