Clean up specs around `Fog::Formatador`
Clean up specs around `Fog::Formatador`

This switches to a number of anonymous classes with a wider range of
settings to test `Fog::Formatador.format` which should be able to deal
with more that simple cases.

[#138]

SpryBTS/fog-core,higanworks/fog-core,Temikus/fog-core,fog/fog-core,mdarby/fog-core