Move DnsResolver to org.java_websocket.client and fix code style

src/main/java/org/java_websocket/client/DnsResolver.java

@@ -0,0 +1,29 @@
+package org.java_websocket.client;
+
+import java.net.InetAddress;
+import java.net.URI;
+import java.net.UnknownHostException;
+
+/**
+ * Users may implement this interface to override the default DNS lookup offered
+ * by the OS.
+ *
+ * @since 1.4.1
+ */
+public interface DnsResolver {
+
+	/**
+	 * Resolves the IP address for the given URI.
+	 *
+	 * This method should never return null. If it's not able to resolve the IP
+	 * address then it should throw an UnknownHostException
+	 *
+	 * @param uri The URI to be resolved
+	 *
+	 * @return The resolved IP address
+	 *
+	 * @throws UnknownHostException if no IP address for the <code>uri</code> could be found.
+	 */
+	InetAddress resolve(URI uri) throws UnknownHostException;
+
+}

src/main/java/org/java_websocket/client/WebSocketClient.java

@@ -48,7 +48,6 @@
 import javax.net.ssl.SSLSocketFactory;
 
 import org.java_websocket.AbstractWebSocket;
-import org.java_websocket.DnsResolver;
 import org.java_websocket.WebSocket;
 import org.java_websocket.WebSocketImpl;
 import org.java_websocket.drafts.Draft;