#34 Change use of deprecated NetworkInfo enhancement (#38)

* replace NetworkInto with the ConnectivityManager. Since this network validation is being done at repository level, I've had to add the network dependency on it's own AndroidManifest.

* moved network_state_permission from repository manifest to app's manifest.
removed wildcard imports.
now, network_info it's been provided and not the connectivity_manager

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     package="com.melih.rocketscience">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <application
         android:name=".App"