Allow same action name on diffrent ActionClasses

without this there can be for example only one action named 'update'.
with this you can have multiple ActionClasses with same actions.

class UserActions {
	constructor() { this.generateActions('update'); }
}
module.exports = alt.createActions(UserActions);

class LinkActions {
	constructor() { this.generateActions('update'); }
}
module.exports = alt.createActions(LinkActions);

src/alt.js

@@ -273,7 +273,7 @@ your own custom identifier for each store`
 
  return Object.keys(actions).reduce((obj, action) => {
  let constant = formatAsConstant(action)
- let actionName = Symbol.for(`action ${action}`)
+ let actionName = Symbol.for(`action ${ActionsClass.name} ${action}`)
 
  // Wrap the action so we can provide a dispatch method
  let newAction = new ActionCreator(