Log Message:
Update ruby-mercenary to 0.3.5.

## 0.3.5 / 2014-11-12

### Bug Fixes

  * Capture `OptionsParser::InvalidOption` and show a nice error message (#38)
  * Absolute paths for requires and autoloads (#39)

### Development Fixes

  * Bump to RSpec 3 (#40)

## 0.3.4 / 2014-07-11

### Bug Fixes

* Use option object as key in the command's `@map` hash (#35)