Removed the logic in MimeMessage.WriteTo() that enforced a Date header.

Fixes issue #41
Fixed up the new Windows 8.1 Universal project references
Fixed up the Windows 8.1 Universal OutputPaths and IntermediateOutputPaths
Set the MessageId header in the .ctor rather than in WriteTo

Fixes issue #43
Bumped version to 0.30.0.0
Updated MimeKitLite.nuspec
updated docs
Made SecureMimeContext.GetPreferredEncryptionAlgorithm() protected virtual instead of private

Addresses issue #44 - thanks to mahet for proposing this change and sending a Pull Request
Added MimeKit.Cryptography.MD5 for .NETPortable versions of MimeKit
Allow adding binary data as attachment
Add angle brackets to each message-id when serializing the References header

Fixes issue #45
Merge pull request #46 from cmayer0087/master

Allow adding binary data as attachment
Fixed code formatting, added another AttachmentCollection.Add method, and added docs for previous commit
Bumped version to 0.31.0.0
Updated MimeKitLite.nuspec
Merged MimeKitLite.Mobile.sln into MimeKitLite.sln and updated MimeKitLite.nuspec

The next release of MimeKitLite will include the Android and iOS assemblies.