* Rewrite of MVC migration topic to update to 3.1.
* Updated app sample for 3.1, moved samples into 3.x and 2.x directories.
* Changed the structure/approach of the 3.x version migration so that the migration is between two solutions in order to keep the namespaces between projects intact and avoid renaming. This has the downside of having to use "Add Files" to copy from one solution to another rather than copy/paste, having tested both approaches out migrating between solutions was less steps and had less chance of error, missing a namespace. Add Files allows you to mass select files, so not a big difference even for the copy step.
* Separated out the topic to 3 versions, and improved on those 3. Moniker ranges with copies targeted at >= 3.0, =2.2 and <2.2
* Removed screen shots in 3.x version that were related to steps experienced ASP.NET developers would be very familiar with , such as creating a new project, etc.
Removed some of the "optionally you can..." suggestions to cut down on the confusion for the steps.
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