add Appraisal to test against Rails 3 and Rails 4

```
rake appraisal:install
rake appraisal
```

[Appraisal](https://github.com/thoughtbot/appraisal)
configuration for Travis.ci
test against final rails 4.0 release
update Appraisal for Rails 3.2.14
Merge pull request #368 from GetJobber/appraisal

Let's start testing against Rails 3 and Rails 4