0.6.4 - Polish the included install/uninstall experience

Changes

 - introduced Title (fallback to Id) property on WelcomeViewModel
 - introduced Summary property and updated view
 - logging switches to `%AppData%\Shimmer\{PackageName}.txt` as soon as the package is resolved
 - happy path testing - install package, run `Initialize-Installer` from Powershell Command Prompt, then build and it's generating packages! huzzah!

![screen shot 2013-08-26 at 8 46 23 pm](https://f.cloud.github.com/assets/359239/1025191/ca79eda8-0e3c-11e3-8066-d2d68d73f9e0.png)

TODO:

 - [x] enhance the InstallingViewModel (same header as WelcomeViewModel?)
 - [x] add a powershell script to NuGet package to enable/disable package creation (no manually editing csproj)
 - [x] add a powershell script to populate an nuspec template (pre-populated) at the root of a certain project folder
 - ~~[ ] get logging to a point where you can see more about the flow of the installer (type resolution for the setup, etc)~~
 - ~~[ ] the uninstall view doesn't show AT ALL. IT'S MAGIC.~~