Added the initial tests
Added the hex_string function
Added tests for the generate_hex_name method
Added the generate_hex_name method
Added documentation for the generate_hex_name method
Incremented the gem version to `1.0.0`

The gem now provides all planned features. Because of this, the official version will now be `1.0.0`. In future, version numbers will take the following format:

	<major_version>.<minor_version>.<patch>
Merge pull request #6 from andyhmltn/optional-hex-string

Added a 'generate_hex_name' method