merged branch Marmelatze/var_dump (PR #5291)

Commits
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9c20634 fixes pre for var_dump with xdebug

Discussion
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Displaying var_dump with xdebug in exceptions

When debugging code I often use `var_dump` to quickly look into variables. Since 2.1 alle output generated by `var_dump` is displayed in one line. http://screencast.com/t/11LuIlIdHsvP
It seems to be no problem for small objects, but it becomes a real pain when displaying huge arrays or objects.

This is caused by the changed word-wrapping for the pre tag introduced in #3827

With fix: http://screencast.com/t/GdA3dkpWxU

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by dlsniper at 2012-08-17T17:22:38Z

:+1:

Resources/public/css/exception_layout.css

@@ -134,3 +134,8 @@ pre {
     white-space: normal;
     font-family: Arial, Helvetica, sans-serif;
 }
+
+pre.xdebug-var-dump{
+    white-space: pre;
+    font-family: monospace;
+}