Reorganize projects and nuget build
Separate Postal-net40 project
Add build files to solution
Web.config for postal package
Remove EmailHttp* implementations

Causing too much trouble with the .NET 4.0 -> 4.5 in-place update.
It seems that constructing real HttpContext, HttpRequest and HttpResponse
objects works fine.
This should be more reliable going forward as well.
Test with MVC3 and MVC4
New WebSample project
Fix MVC versions
XML docs
Equalize assembly reference versions
Remove explicit RazorEngine dependenct from nuspec

It's causing problems with Install-Package version resolution of the
ASP.NET packages.
SpecificVersion=False for MVC reference
Build correct URL root
3-part package version instead of 4-part
WebSample should save emails for now