Core: Fixing display problem with Zurb Foundation

This fixes #758

Zurb Foundation doesn't use specific class for <code>table</code> so it mess up with Glimpse table. The best would be to fix Foundation but this will generate a major braking change for them so I tweak a little bit the Glimpse CSS to handle that. They also use a CSS reset that generate problems for the <code>ul</code> of the Glimpse menu [Cache, Configuration, etc.] 

## Before:
![image](https://cloud.githubusercontent.com/assets/1680372/3277398/bf01816a-f370-11e3-9070-d9990b7a8305.png)
![image](https://cloud.githubusercontent.com/assets/1680372/3277395/963d4340-f370-11e3-96d7-d4f514fe2623.png)

## After:
![image](https://cloud.githubusercontent.com/assets/1680372/3277396/9f36c872-f370-11e3-97e9-0c37df3735d3.png)
![image](https://cloud.githubusercontent.com/assets/1680372/3277397/a73b3b52-f370-11e3-872a-5c02e97144d9.png)

## CSS added:
It's not easy to see differences because the very long single line of CSS so here what I added with indentation:

    glimpse-tabs ul {
        line-height: 13px;
    }
    .glimpse table tr:nth-of-type(even) {
        background-color: transparent;
    }