Target WP8
Solution/project configuration cleanup

Removed platforms: Any CPU, Mixed
Removed config: Release Trial

This means you'll have to pick x86/ARM when building and testing.

Change-Id: Ie90c3d0413c661c4a73204c61ae70b8885901408
Merge pull request #1 from PeteVasi/SolutionFixesRemoveAnyCPU

Solution fixes - Remove Any CPU