removed redundant ribica name from subfolders

front-api/db/migrate/20150118035004_create_units.rb

@@ -0,0 +1,8 @@
+class CreateUnits < ActiveRecord::Migration
+  def change
+    create_table :units do |t|
+      t.string :name
+      t.string :short_name, limit: 4
+    end
+  end
+end