Acoording to the Ruby's convention, to_str should not be defined for objects which doesn't act like String. Instead, to_s is generally recommended for printing purpose.
Fiexed verification code examples to be consistent.
Fixed a remaining issue caused by the different behavior of the inspect method between Ruby 1.9 and 2.0. Improved consistency among README and examples (unified 'device_info' to 'access_map' and removed unnecessary .map{|x| x.to_s} for join)
Merge pull request #11 from ktym/master

Fixed document (and relevant example code) for consistency and for hiding the iCredit testing URL