"warning: mismatched indentations"

* warning: mismatched indentations at 'end' with 'case' at 28
* warning: mismatched indentations at 'end' with 'if' at 25
"warning: `*' interpreted as argument prefix"
"warning: `&' interpreted as argument prefix"
Merge pull request #52 from amatsuda/fix_warnings

Fix ruby warnings