Repeated "Mc" prefix leads to incorrect duplication

[aprescott]

I'm not sure if this is actually a bug, given possible real-world inputs, but it certainly seems wrong.

>> NameCase("mcfoo mcbar")
=> "McFoo McFoo"
>> NameCase("MCFOO MCBAR")
=> "McFoo McFoo"

The "McBar" has been clobbered by "McFoo" because the replacement is global across the whole string. This gem seems to support passing a full first+last name input, so this looks like a bug to me.

Note this working case, though:

>> NameCase("McFoo McBar")
=> "McFoo McBar"