Remove VS14 steps

CONTRIBUTING.md

@@ -35,35 +35,15 @@ git clone --recursive https://github.com/Microsoft/RTVS.git
 
 The remaining dependencies are referenced as NuGet packages, and will be automatically downloaded by VS during the build.
 
-### First build and switching between Visual Studio versions
-RTVS can be built for *Visual Studio 2015* aka *VS14* and *Visual Studio 15 Preview* aka *VS15*.    
-Accordingly, to build for the former, R.sln must be opened in VS14, and to build the latter, it has to be opened in VS15.
-
-Some of the nuget dependencies for VS14 and VS15 are incompatible:
-
-| Nuget package                        | VS14           | VS15                     | Dependent projects
-| ------------------------------------ |---------------:| ------------------------:| ------------------
-| Microsoft.VSSDK.BuildTools           | 14.2.25201     | 15.0.25201-Dev15Preview2 | <ul><li>Microsoft.VisualStudio.R.Package</li></ul>
-| Microsoft.VisualStudio.ProjectSystem | 14.0.50617-pre | 15.0.183-pre             | <ul><li>Microsoft.VisualStudio.ProjectSystem.FileSystemMirroring</li><li>Microsoft.VisualStudio.ProjectSystem.FileSystemMirroring.Test</li><li>Microsoft.VisualStudio.R.Package</li><li>Microsoft.VisualStudio.R.Package.Test</li><li>Microsoft.VisualStudio.Shell.Mocks</li></ul>
-
-Because of that, `project.json` in the dependent projects has to be updated before they can be built. This can be done:
-- By running `msbuild src/build.proj /t:ResetNuget` from the root folder in *Developer Command Prompt for VS2015* for *VS14* or in *Developer Command Prompt for VS15* for *VS15*. Executing `msbuild build.proj /t:Reset` will also erase `bin` and `obj` folders.
-- By rebuilding solution several times. 
-  - During first run, `project.json` will be replaced by either `project.14.0.json` or `project.15.0.json` in projects that require replacement.
-  - During second run, nuget will update its `project.lock.json` files and related `*.nuget.props` and `*.nuget.targets` files
-  - During third run, projects will be built
-- Manually by replacing `project.json` content and deleting all `project.lock.json`, `*.nuget.props` and `*.nuget.targets` files
-
-This step is required before first build and every time R.sln is opened in the different version of Visual Studio.
 
 ### Building and running the product
-1. Open `R.sln` solution file in Visual Studio 2015 or Visual Studio 15 Preview.
+1. Open `R.sln` solution file in Visual Studio 2017.
 1. Set `Microsoft.VisualStudio.R.Package` as a startup project.
-1. If you are not planning to build the installer MSI (see next section), you can also unload `Setup`, `SetupRHost` and `SetupCustomActions` projects.
+1. If you are not planning to build the installer MSI (see next section), you can also unload `SetupRemote` and `SetupRHost` projects.
 1. Build the solution. Note that this will _not_ build `Setup` by default.
 1. Start Debugging (F5).
 1. VS experimental instance should start, and you should see "R Tools" entry in the main menu.
 
-### Building the installer
+### Building the remote services installer
 1. Build `Setup` project specifically (right-click on it in Solution Explorer and select "Build").
 1. Look for the MSI that it generates under `bin`. Running it will install the product.