[openstreetmap-website] Allow users to 'maximize' the map/edit area (#331)

[CloCkWeRX]

As a contributor, particularly when I am editing, I often wish to maximize the screen real estate given to the editing tool.

I rarely will use left hand side links while editing, as I have swapped from a 'passive viewing' to 'interaction, task specific' mode of use.

![image](https://f.cloud.github.com/assets/365751/792375/e365c42c-eb91-11e2-92fa-35b22f886eb8.png)

A simple 'hide left hand nav' UI toggle would greatly improve the editing experience.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/331
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