fix(database): fix issue with missing repo method

Author: jshcrowthe

src/database/api/Database.ts

@@ -17,8 +17,7 @@ export class Database {
   repo_: Repo;
   root_: Reference;
   INTERNAL;
-  private __database: Database;
-
+  
   static ServerValue = {
     'TIMESTAMP': {
       '.sv' : 'timestamp'
@@ -47,10 +46,6 @@ export class Database {
     return this.repo_.app;
   }
 
-  get database(): Database {
-    return this.__database || (this.__database = new Database(this));
-  }
-
   /**
    * Returns a reference to the root or the path specified in opt_pathString.
    * @param {string=} pathString
@@ -110,6 +105,12 @@ export class Database {
   }
 };
 
+Object.defineProperty(Repo.prototype, 'database', {		
+  get() {		
+    return this.__database || (this.__database = new Database(this));		
+  }		
+});
+
 class DatabaseInternals {
   database
   /** @param {!Database} database */