CB-5739: wp8/wp7

Consolidates all Windows Phone content into one topic, plus shell tools and extra config info to develop on VMware/Parallels. WP content ready for review.

Note additional commits not tied to CB-5739 for extraneous fixes, most importantly Feb 7's "rewrite overview," which should better clarify CL/shell workflows.

Unresolved issues:

* Supposedly as an alternative to VMWare/Parallels, you can develop in Win8 running under VirtualBox on a Mac as described at MSDN: http://bit.ly/1lDOzYH. This procedure fails for me with a "critical error"  at step #19, when launching the VM.  Any idea why?  (I contacted their user group for guidance.)

* Was unable to run "cordova emulate wp7" to access alternate emulator within both Parallels & VMWare. In both cases, it produces the gray wp7 device emulator that stays hanging in a boot phase without ever getting to the home screen. Need to confirm it works, and overwrite the placeholder image to match the screen shot for the WP8 emulator.

* There were existing instructions to install Cordova "New Project" templates, but I couldn't get the procedure to work in the latest WP SDK.  Willing to pursue a fix & reincorporate this content if it's a significant use case; otherwise the new doc instructs how to open a project bootstrapped with the CLI.

* The revised platform guides present two basic dev options: CLI, or shell tools. It says you should get the shell tools from the cordova.apache.org distribution. But the Overview's discussion of workflows says you can transition from CLI to shell-tool/SDK dev. Correct to say you can also access the shell	tools for projects bootstrapped with the CLI from each platforms/*/cordova/ directory? Any major differences?

* The UI of the latest VMWare v.6 appears much different than the what's documented at the link. IMO, this is insignificant.