PeanutButter 1.2.0 Release

Short on the heals of the PeanutButter.Utils.Windsor package release, I've updated PeanutButter for all projects and packages to target the .NET framework version 4.5.2. If this doesn't work for you (and it really should), then don't upgrade past 1.1.44.

Why did I do it? .NET 4.5.1 reached EOL on January 16 2016. Nothing should really have changed for any PB consumers -- indeed, I've also cleaned up the nuget package structure to reflect that all packages target .NET 4.5.x and made the change unanimous across the board, thanks to a Visual Studio extension which made it super-easy: Target Framework Migrator Extension (https://visualstudiogallery.msdn.microsoft.com/47bded90-80d8-42af-bc35-4736fdd8cd13)

Anyway, just thought that the few people who read about this stuff should get a heads-up (: