Removed CURL from WP8 project. Fixed CocoStudio changes that broke all WP8 and WinRT builds

1. Removed libcurl from WP8 project. It broke most of the WP8 builds and all of thew WinRT builds. Please put libcurl work on a new branch for now. libcurl source code will not pass WP8 app certification test.

2. Updated CocoStudio in libextensions and CocoStudioTests files that were added/removed that broke all WP8 and WinRT builds.