title: Android Studio don't recognise signing configuration declared in a properties file
body: <p>I have the following key store info store in <code>keystore.properties</code> in root folder</p>
  
  <pre><code>storePassword=******
  keyPassword=******
  keyAlias=******
  storeFile=/home/jerry/jerryKeyStore 
  </code></pre>
  
  <p>and the following gradle code to load it</p>
  
  <pre><code>// Create a variable called keystorePropertiesFile, and initialize it to your
  // keystore.properties file, in the rootProject folder.
  def keystorePropertiesFile = rootProject.file("keystore.properties")
  
  // Initialize a new Properties() object called keystoreProperties.
  def keystoreProperties = new Properties()
  
  // Load your keystore.properties file into the keystoreProperties object.
  keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
  
  android {
  
  signingConfigs {
      release {
          keyAlias keystoreProperties['keyAlias']
          keyPassword keystoreProperties['keyPassword']
          storeFile file(keystoreProperties['storeFile'])
          storePassword keystoreProperties['storePassword']
      }
  }
  </code></pre>
  
  <p>When I open the signing tab of project structure window, Android Studio reads <code>Unrecognized value</code> in all signing fields.
  It also can't install the APK on my device, throwing an error that APK was built with different key.. as I built it with signing info written directly into the gradle file </p>
  
  <p>I use the following <br>
  Android Studio: 2.1.2<br>
  Gradle: 2.1.0</p>