Repository: ProcessMaker/nayra (php)

Issue:
Remove createStorage from Repository and RepositoryInterface it is not used
`
    /**
     * Creates a storage interface
     *
     * @return ProcessMaker\Nayra\Contracts\Repositories\StorageInterface
     */
    public function createStorage()
    {
        return new BpmnDocument();
    }
`

Pull request description:
Remove createStorage from Repository and RepositoryInterface it is not used. Resolves #90
Removed unused code.


Patch:
diff --git a/src/ProcessMaker/Nayra/Contracts/RepositoryInterface.php b/src/ProcessMaker/Nayra/Contracts/RepositoryInterface.php
index c756c53..356cc00 100644
--- a/src/ProcessMaker/Nayra/Contracts/RepositoryInterface.php
+++ b/src/ProcessMaker/Nayra/Contracts/RepositoryInterface.php
@@ -285,11 +285,4 @@ interface RepositoryInterface
      * @return \ProcessMaker\Test\Models\ExecutionInstanceRepository
      */
     public function createExecutionInstanceRepository(StorageInterface $factory);
-
-    /*
-     * Creates a storage interface
-     *
-     * @return ProcessMaker\Nayra\Contracts\Repositories\StorageInterface
-     */
-    public function createStorage();
 }


Test patch:
diff --git a/tests/ProcessMaker/Test/Models/Repository.php b/tests/ProcessMaker/Test/Models/Repository.php
index 77c3f8c..44061a0 100644
--- a/tests/ProcessMaker/Test/Models/Repository.php
+++ b/tests/ProcessMaker/Test/Models/Repository.php
@@ -5,7 +5,6 @@ namespace ProcessMaker\Test\Models;
 use ProcessMaker\Nayra\Contracts\Repositories\StorageInterface;
 use ProcessMaker\Nayra\Contracts\RepositoryInterface;
 use ProcessMaker\Nayra\RepositoryTrait;
-use ProcessMaker\Nayra\Storage\BpmnDocument;
 use ProcessMaker\Test\Models\CallActivity;
 use ProcessMaker\Test\Models\ExecutionInstance;
 use ProcessMaker\Test\Models\FormalExpression;
@@ -54,16 +53,6 @@ class Repository implements RepositoryInterface
         return new ExecutionInstanceRepository($factory);
     }
 
-    /*
-    * Creates a storage interface
-    *
-    * @return ProcessMaker\Nayra\Contracts\Repositories\StorageInterface
-    */
-    public function createStorage()
-    {
-        return new BpmnDocument();
-    }
-
     /**
      * Create a execution instance repository.
      *