Add example file demonstrating whitespace issues

While at it, fix samples file count for cli_spec.lua accordingly.

Author: n1tehawk

spec/cli_spec.lua

@@ -934,7 +934,7 @@ spec/samples/python_code.lua:1:6: (E011) expected '=' near '__future__'
    end)
 
    it("expands folders", function()
-      assert.matches("^Total: %d+ warnings / %d+ errors in 20 files\n$", get_output "spec/samples -qqq --no-config")
+      assert.matches("^Total: %d+ warnings / %d+ errors in 21 files\n$", get_output "spec/samples -qqq --no-config")
    end)
 
    it("uses --include-files when expanding folders", function()

spec/samples/bad_whitespace.lua

@@ -0,0 +1,34 @@
+-- Examples of whitespace formatting violations
+
+local function trailing_whitespace_in_code()
+   return "This is awful" 
+end
+
+local function trailing_whitespace_in_comment()
+   -- Less awful, but... 
+   return "Still bad"
+end
+
+local function trailing_whitespace_mixed()
+   return "Not much better" -- You bet! 
+end
+
+local function whitespace_only_lines()
+ 
+	
+		
+   
+   return "Lost in space"
+end
+
+local function inconsistent_indentation()
+ 	return "Don't do this"
+end
+
+return { -- fake "module" table
+   trailing_whitespace_in_code,
+   trailing_whitespace_in_comment,
+   trailing_whitespace_mixed,
+   whitespace_only_lines,
+   inconsistent_indentation,
+}