Add missing catch blocks for migration from 1.1.1 to 1.2.0

Signed-off-by: Hugo Caloto <hcaloto@gmail.com>

lib/migrations/20161201050312-support-email-signin.js

@@ -2,7 +2,19 @@
 module.exports = {
   up: function (queryInterface, Sequelize) {
     return queryInterface.addColumn('Users', 'email', Sequelize.TEXT).then(function () {
-      return queryInterface.addColumn('Users', 'password', Sequelize.TEXT)
+      return queryInterface.addColumn('Users', 'password', Sequelize.TEXT).catch(function (error) {
+        if (error.message === "ER_DUP_FIELDNAME: Duplicate column name 'password'") {
+          console.log('Migration has already run… ignoring.')
+        } else {
+          throw error
+        }
+      })
+    }).catch(function (error) {
+      if (error.message === "ER_DUP_FIELDNAME: Duplicate column name 'email'") {
+        console.log('Migration has already run… ignoring.')
+      } else {
+        throw error
+      }
     })
   },