mikel/mail — pull request #775 by grosser (2014-08-06 05:44:19+00:00)
Title: avoid failed encodings / stop bad charsets early

@bf4 @jeremy

hotfix:
```Ruby
module NoInvalidEncoding
def pick_encoding(enc)
Encoding.find(super(enc)).to_s
rescue ArgumentError
"ISO-8859-1"
end
end

class << Mail::Ruby19
prepend NoInvalidEncoding
end
```