[docs] added misc new doc files plus related todo's

docs/core/app.md

@@ -26,7 +26,7 @@ console.log("storageBucket", defaultApp.options.projectId);
 ```
 
 
-TODO api ref docs:
+<!-- TODO api ref docs: -->
 
  - name: String
  - options: Object

docs/core/config-default-app.md

@@ -0,0 +1,4 @@
+<!-- TODO -->
+
+### Enable Database Persistence
+

docs/core/config-rnfirebase.md

@@ -0,0 +1,5 @@
+<!-- TODO -->
+### Log Options
+
+### Debug Options
+

docs/core/firebase.md

@@ -1,10 +1,9 @@
 # Firebase
 
-TODO api ref docs:
-
- - apps(): Array<FirebaseApp>
- - app(): FirebaseApp
- - initializeApp(): FirebaseApp
- - setLogLevel()
- - SDK_VERSION: String
- - googleApiAvailability: Object
+<!-- TODO api ref docs -->
+<!-- TODO - apps(): Array<FirebaseApp> -->
+<!-- TODO - app(): FirebaseApp -->
+<!-- TODO - initializeApp(): FirebaseApp -->
+<!-- TODO - setLogLevel() -->
+<!-- TODO - SDK_VERSION: String -->
+<!-- TODO - googleApiAvailability: Object -->

docs/faqs.md

@@ -2,12 +2,7 @@
 
 ## Usage with Expo
 
-If you use Expo and would like to use this package, you'll need to eject. If you do not want to eject, but wish to make use of features
-such as Realtime Database (without offline support) & Authentication, you can still use the Firebase Web SDK in your project. 
-
-For features such a Crash Reporting, Push Notifications (via Firebase not Expo), Performance Monitoring, AdMob, Analytics, Storage & Remote Config, you will have to eject your Expo project as these require the native SDKs, as the Web SDK does not support these.
-
-You can see an indepth conversation [here](https://expo.canny.io/feature-requests/p/full-native-firebase-integration).
+ See [usage with expo](/faq/expo).
 
 ## Comparison to Firestack
 

docs/migration-guide.md

@@ -2,7 +2,7 @@
 
 ## From v2 to v3
 
-TODO
+<!-- TODO -->
 
 ## From v1 to v2
 

docs/modules/storage.md

@@ -81,7 +81,7 @@ const unsubscribe = firebase.storage()
                         });
 ```
 
-## TODO
+<!-- TODO -->
 
 There are a few methods which have not yet been implemented for Storage:
 

docs/modules/transactions.md

@@ -4,7 +4,7 @@
 
 ### Android Implementation
 
-The [android implementation](https://github.com/invertase/react-native-firebase/blob/master/android/src/main/java/io/invertase/firebase/database/RNFirebaseTransactionHandler.java) makes use of [Condition](https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/Condition.html) and [ReentrantLock](https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/ReentrantLock.html) locks to handle transactions across the React Native Bridge. 
+The [android implementation](https://github.com/invertase/react-native-firebase/blob/master/android/src/main/java/io/invertase/firebase/database/RNFirebaseTransactionHandler.java) makes use of [Condition](https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/Condition.html) and [ReentrantLock](https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/ReentrantLock.html) locks to handle transactions across the React Native Bridge.
 
 
 ### iOS Implementation
@@ -13,7 +13,6 @@ The [iOS implementation](https://github.com/invertase/react-native-firebase/blob
 
 !> Transactions that receive no response from react native's JS thread within 30 seconds are automatically aborted - this value is currently not configurable - PR welcome.
 
-
 ## Example
 
 ```javascript

docs/redux.md

@@ -1,8 +1,9 @@
 # Usage with Redux
 
 Although RNFirebase usage requires a React Native environment, it isn't tightly coupled which allows for full flexibility
-when it comes to integrating with other modules such a [`react-redux`](https://github.com/reactjs/react-redux). If you wish to use
-a Redux library designed for Firebase, we suggest taking a look at [`react-redux-firebase`](http://docs.react-redux-firebase.com/history/v2.0.0/docs/recipes/react-native.html)
+when it comes to integrating with other modules such a [`react-redux`](https://github.com/reactjs/react-redux).
+
+If you wish to use a Redux library designed for Firebase, we suggest taking a look at [`react-redux-firebase`](http://docs.react-redux-firebase.com/history/v2.0.0/docs/recipes/react-native.html)
 for implementation with this module.
 
 ## Standalone integration
@@ -21,14 +22,14 @@ export const subscribe = () => {
   return (dispatch) => {
     firebase.database().ref('todos').on('value', (snapshot) => {
       const todos = [];
-      
+
       snapshot.forEach((childSnapshot) => {
         todos.push({
           id: childSnapshot.key,
           ...(childSnapshot.val()),
         })
       })
-      
+
       dispatch({
         type: 'TODO_UPDATE',
         todos,
@@ -67,7 +68,7 @@ const todos = (state = {}, action) => {
     case 'TODO_UPDATE':
       return { ...action.todos };
   }
-  
+
   return state;
 }
 
@@ -92,20 +93,20 @@ class Todos extends React.Component {
       subscribe()
     );
   }
-  
+
   onComplete = (id) => {
     this.props.dispatch(
       completeTodo(id)
     );
   };
-  
+
   onAdd = (text) => {
     this.props.dispatch(
       addTodo(text)
     );
   };
-  
-  render() {    
+
+  render() {
     return (
       <FlatList
         data={this.props.todos}