Fix showing metadata header problems #1759
Merged
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This fixes #1745 by escaping the text to be shown in the prep and sample metadata messages before sending into the javascript, then unescaping it before being shown. This removes all characters that could interfere with the javascript working.
See the broken /slash and broken \slash columns above that would otherwise break the system.
![screen shot 2016-04-08 at 14 53 39](https://cloud.githubusercontent.com/assets/3079066/14398539/d1eb07b2-fd99-11e5-9735-fb9f7532efe2.png)