more encodings and their equivalents

our users use a bunch of things ruby does not support, after a bit of googling most of them are very similar to ISO_8859-X

not sure if there is a better place for there tests ...

@bf4 @jeremy 
Ruby has `Encoding::CP850`

`ansi_x3.110-1983` is not latin1. It's close, but this would be lossy. http://tools.ietf.org/html/rfc1345