Classes @Nullable and @NotNull are added to runtime

This is needed because Kotlin now annotates all emitted byte code with @Nullable and @NotNull, and a verifier like proguard would reject the code unless the classes are on the class path

runtime/src/org/jetbrains/annotations/NotNull.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.annotations;
+
+import java.lang.annotation.*;
+
+/**
+ * An element annotated with NotNull claims <code>null</code> value is <em>forbidden</em>
+ * to return (for methods), pass to (parameters) and hold (local variables and fields).
+ * Apart from documentation purposes this annotation is intended to be used by static analysis tools
+ * to validate against probable runtime errors and element contract violations.
+ */
+@Documented
+@Retention(RetentionPolicy.CLASS)
+@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
+public @interface NotNull {
+    String value() default "";
+}

runtime/src/org/jetbrains/annotations/Nullable.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.annotations;
+
+import java.lang.annotation.*;
+
+/**
+ * An element annotated with Nullable claims <code>null</code> value is perfectly <em>valid</em>
+ * to return (for methods), pass to (parameters) and hold (local variables and fields).
+ * Apart from documentation purposes this annotation is intended to be used by static analysis tools
+ * to validate against probable runtime errors and element contract violations.
+ */
+@Documented
+@Retention(RetentionPolicy.CLASS)
+@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
+public @interface Nullable {
+    String value() default "";
+}