Using dotnet publish to find refs for docs

This speeds up doc generation considerably and more reliably by relying on dotnet publish rather than trying to convice FCS to give the reference

Content/Library/build.fsx

@@ -626,18 +626,6 @@ let buildDocs _ =
     DocsTool.build ()
 
 let watchDocs _ =
-    let watchBuild () =
-        !! srcGlob
-        |> Seq.map(fun proj -> fun () ->
-            dotnet.watch
-                (fun opt ->
-                    opt |> DotNet.Options.withWorkingDirectory (IO.Path.GetDirectoryName proj))
-                "build"
-                ""
-            |> ignore
-        )
-        |> Seq.iter (invokeAsync >> Async.Catch >> Async.Ignore >> Async.Start)
-    watchBuild ()
     DocsTool.watch ()
 
 let releaseDocs ctx =
@@ -699,13 +687,11 @@ Target.create "ReleaseDocs" releaseDocs
 "UpdateChangelog" ?=> "GenerateAssemblyInfo"
 "UpdateChangelog" ==> "PublishToNuGet"
 
-"DotnetBuild" ==> "BuildDocs"
 "BuildDocs" ==> "ReleaseDocs"
 "BuildDocs" ?=> "PublishToNuget"
 "DotnetPack" ?=> "BuildDocs"
 "GenerateCoverageReport" ?=> "ReleaseDocs"
 
-"DotnetBuild" ==> "WatchDocs"
 
 "DotnetRestore"
     ==> "DotnetBuild"

Content/Library/docsSrc/Tutorials/Getting_Started.md

@@ -1,11 +1,13 @@
 # Getting Started
 
 ```fsharp
+open MyLib._1
 let foo = ()
 let myAge = 21
+let color = Say.FavoriteColor.Red
 ```
 
-## Here is the path to downloading 
+## Here is the path to downloading
 
     [lang=bash]
     paket install MyLib.1

Content/Library/docsSrc/content/style.css

@@ -106,6 +106,7 @@ table.pre td.lines {
 
 body {
   font-family: 'Open Sans', serif;
+  background-color: #BADA55;
 }
 
 pre {

Content/Library/docsTool/Prelude.fs

@@ -9,3 +9,23 @@ module Uri =
         match Uri.TryCreate(url, UriKind.Absolute) with
         | (true, v) -> v
         | _ -> failwithf "Bad url %s" url
+
+module Directory =
+    open System
+    open Fake.Core
+    let dispose (d : #IDisposable) = d.Dispose()
+    type DisposableDirectory (directory : string) =
+        do
+            Trace.tracefn "Created disposable directory %s" directory
+        static member Create() =
+            let tempPath = IO.Path.Combine(IO.Path.GetTempPath(), Guid.NewGuid().ToString("n"))
+            IO.Directory.CreateDirectory tempPath |> ignore
+
+            new DisposableDirectory(tempPath)
+        member x.Directory = directory
+        member x.DirectoryInfo = IO.DirectoryInfo(directory)
+
+        interface IDisposable with
+            member x.Dispose() =
+                Trace.tracefn "Deleting directory %s" directory
+                IO.Directory.Delete(x.Directory,true)