Metadata "ASCII" contents cannot contain "non-printable" characters (less than 32)

[KevinFHartmann]

From the javadoc:

"The strings contain only following characters:
Space: 0x20, but must not be at the beginning or at the end of the value. Leading or trailing whitespace may not be preserved.
ASCII visible characters (0x21-0x7E)"

Our stack-traces contain newlines (0x0a). We should sanitize all of our exceptions by stripping all of the characters outside of the range; or switch to the base64 encoded versions.