Merge branch 'master' of https://github.com/invertase/react-native-firebase into v3

# Conflicts:
#	ios/RNFirebase/admob/RNFirebaseAdMob.m
#	ios/RNFirebase/database/RNFirebaseDatabase.h
#	ios/RNFirebase/database/RNFirebaseDatabaseReference.m
#	lib/modules/admob/index.js
#	tests/ios/Podfile.lock

lib/modules/auth/index.js

@@ -1,13 +1,15 @@
 // @flow
 import User from './user';
 import ModuleBase from './../../utils/ModuleBase';
+import ConfirmationResult from './ConfirmationResult';
 
 // providers
 import EmailAuthProvider from './providers/Email';
+import PhoneAuthProvider from './providers/Phone';
 import GoogleAuthProvider from './providers/Google';
-import FacebookAuthProvider from './providers/Facebook';
-import TwitterAuthProvider from './providers/Twitter';
 import GithubAuthProvider from './providers/Github';
+import TwitterAuthProvider from './providers/Twitter';
+import FacebookAuthProvider from './providers/Facebook';
 
 export default class Auth extends ModuleBase {
   _user: User | null;
@@ -139,6 +141,17 @@ export default class Auth extends ModuleBase {
     return this._interceptUserValue(this._native.signInWithCredential(credential.provider, credential.token, credential.secret));
   }
 
+  /**
+   *
+   * @param phoneNumber
+   * @return {Promise.<TResult>}
+   */
+  signInWithPhoneNumber(phoneNumber: string): Promise<Object> {
+    return this._native.signInWithPhoneNumber(phoneNumber).then((result) => {
+      return new ConfirmationResult(this, result.verificationId);
+    });
+  }
+
   /**
    * Send reset password instructions via email
    * @param {string} email The email to send password reset instructions
@@ -211,9 +224,10 @@ export default class Auth extends ModuleBase {
 }
 
 export const statics = {
-  GoogleAuthProvider,
   EmailAuthProvider,
-  FacebookAuthProvider,
-  TwitterAuthProvider,
+  PhoneAuthProvider,
+  GoogleAuthProvider,
   GithubAuthProvider,
+  TwitterAuthProvider,
+  FacebookAuthProvider,
 };