bug symfony#16964 CSS min-height and min-width should not be "auto" (aschempp)

This PR was merged into the 2.8 branch.

Discussion
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CSS min-height and min-width should not be "auto"

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Setting `min-width` and `min-height` to `auto` does not work in Safari and IE. The `auto` property has been removed from the standard meanwhile (see https://developer.mozilla.org/en-US/docs/Web/CSS/min-height).

Correct is to set a minimum of zero, which is actually "no minimum height".

This is what the web profiler looks like before and after on latest Safari:

![bildschirmfoto 2015-12-11 um 11 02 31](https://cloud.githubusercontent.com/assets/1073273/11741083/f17357fc-9ff6-11e5-8b59-239b38d37b2a.png)

![bildschirmfoto 2015-12-11 um 11 02 25](https://cloud.githubusercontent.com/assets/1073273/11741089/f6fb6656-9ff6-11e5-946f-f6c9f936c17f.png)

Commits
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107c44a CSS min-height and min-width should not be "auto"

Author: nicolas-grekas

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/profiler.css.twig

@@ -276,8 +276,8 @@ table tbody ul {
 }
 
 .metrics-horizontal .metric {
-    min-height: auto;
-    min-width: auto;
+    min-height: 0;
+    min-width: 0;
 }
 .metrics-horizontal .metric .value,
 .metrics-horizontal .metric .label {