update to 4.5
use Prefer32Bit=true for our x86 host
add <Prefer32Bit>true for the x86 tests
remove redundant using
Merge pull request #2107 from Particular/net45

update to 4.5
should throw if we cant load type
make MessagingBestPractices internal
add some more doco to idefer messages
make XmlSanitizingStream  internal
remove redundant doco from obsolete ConfigureDistributor
suppress an error
Merge branch 'develop' into PipelineRegistration