gRPC plugin podspec: license & deployment target

For the spec to pass linting.

src/objective-c/!ProtoCompiler-gRPCPlugin.podspec

@@ -46,7 +46,39 @@ Pod::Spec.new do |s|
     version. The runtime can be obtained as the "gRPC-ProtoRPC" pod.
   DESC
   s.homepage = 'http://www.grpc.io'
-  s.license  = 'New BSD'
+  s.license  = {
+    :type => 'New BSD',
+    :text => <<-LICENSE
+      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.
+    LICENSE
+  }
   s.authors  = { 'The gRPC contributors' => 'grpc-packages@google.com' }
 
   repo = 'grpc/grpc'
@@ -65,6 +97,9 @@ Pod::Spec.new do |s|
 
   # Restrict the protoc version to the one supported by this plugin.
   s.dependency '!ProtoCompiler', '3.0.0-beta-3.1'
+  # For the Protobuf dependency not to complain:
+  s.ios.deployment_target = '7.1'
+  s.osx.deployment_target = '10.9'
   # Restrict the gRPC runtime version to the one supported by this plugin.
   s.dependency 'gRPC-ProtoRPC', v