Merge pull request #409 from Microsoft/0.19-fix

Change the plugin's build.gradle to depend on RN 0.19.+

Author: geof90

android/app/build.gradle

@@ -22,5 +22,5 @@ android {
 dependencies {
     compile fileTree(dir: "libs", include: ["*.jar"])
     compile "com.android.support:appcompat-v7:23.0.1"
-    compile "com.facebook.react:react-native:+"
-}
+    compile "com.facebook.react:react-native:0.19.+"
+}