Add Travis support and Travis/CodeClimate badges to README
Rename COPYING to LICENSE
Add Gemfile
- Move gemspec outside of Rakefile
- Maintain version as a Ruby constant
- Add bundler tasks to Rakefile
- Add Base32::random_base32 method + tests
- Add test cases for hexadecimal conversion
- Upgrade tests to MiniTest (successor to TestUnit)
- Remove license test from test file
Rename `Base32::TABLE` to `Base32::CHARS`