title: GoogleSignatureVerifier signature not valid message (google play services 9.0.0)
body: <p>I have recently updated to the google play services library version 9.0.0, and I keep getting the following logcat message:</p>
  
  <pre><code>05-19 23:07:30.023 19237-19508/? V/GoogleSignatureVerifier: options.developer.com.developeroptions signature not valid.  Found: 
  </code></pre>
  
  <p>While my app isn't using the google maps api but it is using the analytics, ads, and google plus apis.</p>
  
  <p>The only mention in the documentation regarding the usage of the api key is when using google maps, or android places api.</p>
  
  <p>I have also tried adding the 'com.google.android.geo.API_KEY' with a correct key but it didn't help.</p>
  
  <p>here is my gradle.build file:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.3"
  
      defaultConfig {
          applicationId "options.developer.com.developeroptions"
          minSdkVersion 9
          targetSdkVersion 23
          versionCode 23
          versionName "1.06"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  
  dependencies {
      compile 'com.google.android.gms:play-services-plus:9.0.0'
      compile 'com.android.support:appcompat-v7:23.2.0'
      compile 'com.google.android.gms:play-services-analytics:9.0.0'
      compile 'com.google.android.gms:play-services-ads:9.0.0'
  }
  </code></pre>