Changed the error messages for min and max. If I set a min value of 1 the error message says the value has to be greater than 1 - changed the error message to say the value must be at least 1. If I set a max value of 10 the error message says the value has to be less than 10 - changed the error message to say the value must be no more than 10.
* Initial English error messages file and directory
* Setup methods to specify language and directory to find lang files in
* Change 'alphaDash' validation name to 'slug' for URL slugs
* Now passing all parameters to error message via `vsprintf`
* Add `message` convenience method to easily specify custom message on
last validation rule
* Add tests for error messages