Reorganize packages.

Reserve io.grpc for public API only, and all internal stuff in core to
io.grpc.internal, including the non-stable transport API.

Raise the netty/okhttp/inprocess subpackages one level up to io.grpc,
because they are public API and entry points for most users.

Details:

- Rename io.grpc.transport to io.grpc.internal;
- Move SharedResourceHolder and SerializingExecutor to io.grpc.internal
- Rename io.grpc.transport.{netty|okhttp|inprocess} to
  io.grpc.{netty|okhttp|inprocess}
diff --git a/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java b/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java
new file mode 100644
index 0000000..667a1aa
--- /dev/null
+++ b/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2015, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ *    * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package io.grpc.inprocess;
+
+import com.google.common.base.Preconditions;
+
+import io.grpc.AbstractServerBuilder;
+import io.grpc.HandlerRegistry;
+
+/**
+ * Builder for a server that services in-process requests. Clients identify the in-process server by
+ * its name.
+ *
+ * <p>The server is intended to be fully-featured, high performance, and useful in testing.
+ */
+public final class InProcessServerBuilder extends AbstractServerBuilder<InProcessServerBuilder> {
+  /**
+   * Create a server builder that will bind with the given name.
+   *
+   * @param name the identity of the server for clients to connect to
+   * @param registry the registry of handlers used for dispatching incoming calls
+   * @return a new builder
+   */
+  public static InProcessServerBuilder forName(String name, HandlerRegistry registry) {
+    return new InProcessServerBuilder(name, registry);
+  }
+
+  /**
+   * Create a server builder that will bind with the given name.
+   *
+   * @param name the identity of the server for clients to connect to
+   * @return a new builder
+   */
+  public static InProcessServerBuilder forName(String name) {
+    return new InProcessServerBuilder(name);
+  }
+
+  private final String name;
+
+  private InProcessServerBuilder(String name, HandlerRegistry registry) {
+    super(registry);
+    this.name = Preconditions.checkNotNull(name, "name");
+  }
+
+  private InProcessServerBuilder(String name) {
+    this.name = Preconditions.checkNotNull(name, "name");
+  }
+
+  @Override
+  protected ServerEssentials buildEssentials() {
+    return new ServerEssentials(new InProcessServer(name), null);
+  }
+}