Language Service diagnostics and autocomplete (#9)

* Merge master to dev (#4)

* Misc. clean-ups related to removing unneeded PowerShell Language Service code.
* Remove unneeded files and clean up remaining code.
* Enable file change tracking with Workspace and EditorSession.

* Setup standard src, test folder structure.  Add unit test project.

* Actually stage the deletes.  Update .gitignore

* Integrate SqlParser into the onchange diagnostics to provide error messages.

* Add tests for the language service diagnostics

* Initial implementation for autocomplete.

* Switch to using sys.tables for autocomplete
Move some code into a better class

* Delete unused csproj file.

* Add nuget.config to pickup SQL Parser nuget package

test/ServiceHost.Test/project.json

@@ -6,11 +6,13 @@
   "dependencies": {
     "Newtonsoft.Json": "9.0.1",
     "System.Runtime.Serialization.Primitives": "4.1.1",
+    "System.Data.Common": "4.1.0",
+    "System.Data.SqlClient": "4.1.0",
     "xunit": "2.1.0",
     "dotnet-test-xunit": "1.0.0-rc2-192208-24",
-	"ServiceHost": {
-		"target": "project"
-	  }
+    "ServiceHost": {
+       "target": "project"
+    }
   },
   "testRunner": "xunit",
   "frameworks": {