PROTON-742: Windows SChannel buffer copy error: fix length
PROTON-745: update DataImpl to return arrays of Symbol as Symbol[] instance rather than Object[] instance, and enable Data#putObject() to accept the Symbol[].
PROTON-746: Fix encoding a Ruby symbol into a message body.

The symbol needs to be converted to a string before being encoded.
PROTON-743: Add around wrappers to Ruby Message trat raise errors

Each method that could potentially raise an exception in
Qpid::Proton::Message is now wrapped by a method which checks for, and
then raises, the appropriate runtime error.
NO-JIRA: Removed trailing spaces from the Ruby Messenger class.