Fix bug with https blueprint provider (#79)

* Fix bug with https blueprint provider
* System.IO.Path methods would encode `/` characters
* Also re-order to try shorter paths first, to reduce
the number of NotFound responses
* Need dot in extension

azure-rest-api-specs

@@ -0,0 +1 @@
+Subproject commit baa81416330fbb712ad9f39d2e997ba8afbbb13b

src/Microsoft.Atlas.CommandLine/Templates/FileSystems/ProbingFileSystem.cs

@@ -38,25 +38,24 @@ namespace Microsoft.Atlas.CommandLine.Templates.FileSystems
 
         private IEnumerable<string> WithoutPartialsFolder(string filePath)
         {
-            yield return filePath;
-
-            const string partials = "partials/";
-            if (filePath.StartsWith(partials, StringComparison.Ordinal))
+            const string PartialsFolder = "partials/";
+            if (filePath.StartsWith(PartialsFolder, StringComparison.Ordinal))
             {
-                yield return filePath.Substring(partials.Length);
+                yield return filePath.Substring(PartialsFolder.Length);
             }
+
+            yield return filePath;
         }
 
         private IEnumerable<string> WithoutExtension(string filePath)
         {
-            yield return filePath;
-
-            if (Path.GetExtension(filePath) == ".hbs")
+            const string HbsExtension = ".hbs";
+            if (filePath.EndsWith(HbsExtension))
             {
-                yield return Path.Combine(
-                    Path.GetDirectoryName(filePath),
-                    Path.GetFileNameWithoutExtension(filePath));
+                yield return filePath.Substring(0, filePath.Length - HbsExtension.Length);
             }
+
+            yield return filePath;
         }
     }
 }