Remove trailing white spaces
Make executable
Add BitClust::DocScreen#breadcrumb_title based on sho-h's patch

Fix http://bugs.ruby-lang.org/issues/5503
Change method signature style. refs #7229

Add "self" after unary operator.

Before:
  - -> return value type

After:
  - self -> return value type
Support ARGF. refs #7862

But this change consider 1.9.3 or later.