[openstreetmap-website] No scroll bar for editing lengthy diary entries (#330)

[Will Skora]

There's no scroll bar on the text bar/body when editing diary entries. 

![selection_010](https://f.cloud.github.com/assets/955351/788280/fab0d170-eaf7-11e2-82b5-730206f104e3.png)

You can expand the text box horizontally by dragging the bottom right hand corner, but then the markdown syntax box remains in position and you still can't scroll vertically. 
![selection_011](https://f.cloud.github.com/assets/955351/788299/57502d9a-eaf8-11e2-857e-6338a53f425c.png)



Tested on FF 22 and chrome 28.0.1500.68, both on ubuntu 12.04

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/330
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