Update README.md

Make it general with version
Update VSIX to 1.4.1

1. Made a workaround to get csharp-ember-handlebars-compiler working
properly when bundling
2. Upgrade csharp-ember-handlebars-compiler package to 1.5.0-beta1
3. Update VSIX to 1.4.1
4. Renamed VSIX project directory name as it's too long, and caused VSIX
build problem
5. Truely make EntityFramework in VSIX using 5.0.0 package to make it
compatible with VS2012 update 2.