added grant statements for the test db

I added a grant statement for the onebody_test DB. Following the README instructions results in:
```
Mysql2::Error: Access denied for user 'onebody'@'localhost' to database 'onebody_test': CREATE DATABASE `onebody_test` DEFAULT CHARACTER SET `utf8` COLLATE `utf8_unicode_ci`
```
After executing `rake db:create db:migrate db:seed`  unless you add the additional Grant in this commit.