Ciuy

- Added: Help in the command line executable if used incorrectly.

- Added: Travis CI config.
- Added: Default 'test' task for rake.
- Removed: Support for Ruby 1.8.7, you should not be using Ruby 1.8.

- Changed: Updated License.

- Added: Command line executable.

- Added: Rake task `rake console` to run irb including the gem.

- Added: Aliases validate/validate_ci, validation_digit/get_validation_digit, random/get_random_ci.
- Added: Accept integer values as input to validate.