title: Build type is always "Release"
body: <p>I am obtaining that BuildConfig.BUILD_TYPE returns always "release", even if I am compiling it in debug mode.</p>
  
  <p>I include here a part of my build.gradle:</p>
  
  <pre><code>buildTypes {
          debug {
              debuggable true
              minifyEnabled false
          }
          release {
              debuggable false
              minifyEnabled false
              //md5 sign certificate split in two
              proguardFile './dexguard-config/dexguard-release-conservative.pro'
              //proguardFile getDefaultDexGuardFile('dexguard-release-aggressive.pro')
              proguardFile 'dexguard-project.txt'
          }
  </code></pre>
  
  <p>Thank you!</p>