Add printed argument in Pwnable::fsb
Fix typos
Use `let` instead of defining instance variables
Clean up
Use UTF-8 as the source file encoding

The `# encoding:` comment indicates its file encoding. UTF-8 is enough
and it's default from Ruby 2.0.
Merge pull request #1 from yous/file-encoding-comment

Use UTF-8 as the source file encoding
Merge pull request #2 from yous/rspec-let

Use `let` instead of defining instance variables