Merge pull request #1 from luchoooo/master

Added TransportEncoding support for body messages
InputStream null check.
- NuGet Updates

- Updated for NuGet Package Restore
- Updated to latest PNUnit, NUnit, and Json.NET NuGet packages.
Major Refactor + Portable
- Apparently was missing a change to the examples and tests.
- Some files that were being erroneously ignored.
Re #6
Extended implementation of attachments
Fixed compile errors (commented out attachment-related unit test)
Fixes #6
Re #6
Added example for embedded images
Re #6
Added example for embedded images
Merge pull request #10 from HakanL/Attachments

Attachments
- Fixed event payload trimming bug from SendGrid.
- Changed Deliver() to DeliverAsync() with a proper implementation.
- Fixed an API url issue.
Updated NuGet build and deployment process.
- Attempt to integrate changes from official lib
Update the WP8 project.