Merge branch 'master' of https://github.com/flutter/plugins into fire…

…store-get-documents

# Conflicts:
#	packages/cloud_firestore/CHANGELOG.md
#	packages/cloud_firestore/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java

packages/cloud_firestore/CHANGELOG.md

@@ -1,6 +1,10 @@
-## 0.2.7
+## 0.2.8
 * Support for Query.getDocuments
 
+## 0.2.7
+
+* Add transaction support.
+
 ## 0.2.6
 
 * Build fixes for iOS

packages/cloud_firestore/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java

@@ -108,6 +108,11 @@ private Map<String, Object> parseQuerySnapshot(QuerySnapshot querySnapshot) {
     return data;
   }
 
+  private Transaction getTransaction(Map<String, Object> arguments) {
+    return transactions.get((Integer) arguments.get("transactionId"));
+
+  }
+
   private Query getQuery(Map<String, Object> arguments) {
     Query query = getCollectionReference(arguments);
     @SuppressWarnings("unchecked")