Added watch API support.

Fixes issue #130

src/test/java/org/kohsuke/github/RepositoryTest.java

@@ -0,0 +1,27 @@
+package org.kohsuke.github;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+/**
+ * @author Kohsuke Kawaguchi
+ */
+public class RepositoryTest extends AbstractGitHubApiTestBase {
+    @Test
+    public void subscription() throws Exception {
+        GHRepository r = getRepository();
+        assertNull(r.getSubscription());
+
+        GHSubscription s = r.subscribe(true, false);
+        assertEquals(s.getRepository(), r);
+
+        s.delete();
+
+        assertNull(r.getSubscription());
+    }
+
+    private GHRepository getRepository() throws IOException {
+        return gitHub.getOrganization("github-api-test-org").getRepository("jenkins");
+    }
+}