CompilerAdapter for <javac> task + test for compiler attribute

No test for the typedef <withKotlin/> because Ant 1.7 doesn't seem to support typedef inside <javac>

compiler/integration-tests/testData/javacCompiler/build.log.expected

@@ -0,0 +1,12 @@
+OUT Buildfile: build.xml
+OUT 
+OUT build:
+OUT     [mkdir] Created dir: [Temp]/classes
+OUT     [javac] Compiling 1 source file to [Temp]/classes
+OUT     [javac] Compiling [[[TestData]/root1]] => [[Temp]/classes]
+OUT     [javac] Running javac...
+OUT       [jar] Building jar: [Temp]/hello.jar
+OUT 
+OUT BUILD SUCCESSFUL
+OUT Total time: [time]
+Return code: 0

compiler/integration-tests/testData/javacCompiler/build.xml

@@ -0,0 +1,13 @@
+<project name="Ant Task Test" default="build">
+
+    <target name="build">
+        <delete dir="${temp}/classes" failonerror="false"/>
+        <mkdir dir="${temp}/classes"/>
+        <javac destdir="${temp}/classes" compiler="org.jetbrains.jet.buildtools.ant.KotlinCompilerAdapter">
+          <src path="${test.data}/root1"/>
+        </javac>
+        <jar destfile="${temp}/hello.jar">
+          <fileset dir="${temp}/classes"/>
+        </jar>
+    </target>
+</project>

compiler/integration-tests/testData/javacCompiler/hello.run.expected

@@ -0,0 +1,3 @@
+OUT Hello, a!
+OUT Java
+Return code: 0

compiler/integration-tests/testData/javacCompiler/root1/hello.kt

@@ -0,0 +1,7 @@
+package hello
+
+fun main(args : Array<String>) {
+    for (s in arrayList("a"))
+      println("Hello, $s!")
+    j.Java().f();
+}

compiler/integration-tests/testData/javacCompiler/root1/j/Java.java

@@ -0,0 +1,14 @@
+package j;
+
+import java.lang.String;
+import java.lang.System;
+
+public class Java {
+    public void f() {
+        System.out.println("Java");
+    }
+
+    public static void main(String[] args) {
+        hello.HelloPackage.main(new String[] {});
+    }
+}