Section is determined by the source, not the url

This change allows for top level html content to exists.

source/filesystem_windows_test.go

@@ -0,0 +1,15 @@
+package source
+
+//
+// NOTE, any changes here need to be reflected in filesystem_linux_test.go
+//
+
+// Note the case of the volume drive.  It must be the same in all examples.
+var platformBase = "C:\\foo\\"
+var platformPaths = []TestPath{
+	{"foobar", "foobar", "aaa", "", ""},
+	{"b\\1file", "1file", "aaa", "b", "b/"},
+	{"c\\d\\2file", "2file", "aaa", "d", "c/d/"},
+	{"C:\\foo\\e\\f\\3file", "3file", "aaa", "f", "e/f/"}, // note volume case is equal to platformBase
+	{"section\\foo.rss", "foo.rss", "aaa", "section", "section/"},
+}