use from if passed

lib/migrator.js

@@ -18,17 +18,24 @@ module.exports = (function() {
     var self = this
 
     return new Utils.CustomEventEmitter(function(emitter) {
-      getLastMigrationId.call(self).success(function(migrationId) {
-        migrationId = migrationId || '19700101000000'
-
-        var nonMigratedFiles = getMigrationsFilesSince.call(self, migrationId)
+      var execMigrations = function(from) {
+        var nonMigratedFiles = getMigrationsFilesSince.call(self, from)
 
         nonMigratedFiles.forEach(function(file) {
           executeMigration.call(self, self.options.path + '/' + file)
         })
 
         emitter.emit('success')
-      })
+      }
+
+      if(self.options.from) {
+        execMigrations(self.options.from)
+      } else {
+        getLastMigrationId.call(self).success(function(migrationId) {
+          migrationId = migrationId || '19700101000000'
+          execMigrations(migrationId)
+        })
+      }
     }).run()
   }