Use quoted printable strings in outgoing email

If we are sending non-ASCII strings in the headers of an email
message we should protect them using quoted printable encoding
with a UTF-8 character set.

Bug: issue 387
Change-Id: I19038f7568124e2ca5900222c77110e688158437
Signed-off-by: Shawn O. Pearce <sop@google.com>
3 files changed