Updated README.md

Removed "Program.cs" for "Startup.cs" since the project we are opening doesn't have that file.
Added bullet point in README.md

Added a warning to restart Sublime in the scenario where it's already installed/running while installing the ASP.NET vNext Command Line Tools
Merge pull request #1 from MaximRouiller/patch-1

Updated README.md
Merge pull request #2 from MaximRouiller/patch-2

Added bullet point in README.md for an existing Sublime Install
Removed *.sublime-worspace file
Removed jsonschema tests
Schema validation is now a new package
Removed boilerplate code still in the project
Added install instructions for package control
Rename