Fixes #163 - small fix in the mangling logic, renames all expected test files

test/data/expected/escape_test.html.html.txt

Index: test/data/expected/escape_test.html.html.txt
diff --git a/test/data/expected/escape_test.html.html.txt b/test/data/expected/escape_test.html.html.txt
deleted file mode 100644
index 5c3a888c34250f4491c0e51a2d720523cdf19d81..0000000000000000000000000000000000000000
--- a/test/data/expected/escape_test.html.html.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-Blocked access to external URL http://dart.googlecode.com/svn/branches/bleeding_edge/dart/client/dart.js
-Blocked access to external URL http://dart.googlecode.com/svn/branches/bleeding_edge/dart/client/dart.js
-Content-Type: text/plain
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x56
-  RenderBlock {HTML} at (0,0) size 800x56
-    RenderBody {BODY} at (8,8) size 784x40
-      RenderBlock {DIV} at (0,0) size 784x20
-        RenderText {#text} at (0,0) size 275x19
-          text run at (0,0) width 275: "binding as text (expect <span>hello</span>): "
-        RenderText {#text} at (275,0) size 124x19
-          text run at (275,0) width 124: "<span>hello</span>"
-      RenderBlock {DIV} at (0,20) size 784x20
-        RenderText {#text} at (0,0) size 320x19
-          text run at (0,0) width 320: "binding as SafeHtml (expect hello inside a real span): "
-        RenderInline {SPAN} at (0,0) size 28x19
-          RenderText {#text} at (320,0) size 28x19
-            text run at (320,0) width 28: "hello"
-#EOF