[openstreetmap-website] Fix bottom space forgotten when read a message (#677)

[Marco Antonio]

@tomhughes Using the 3D view in FF inspector can see that the buttons float and are not inside the div container with class=content-inner. The space provided by the div container take effect by doing this:

* Remove `float: left` and `overflow: hidden` attribute in the css style input `.buttons input[type="submit"], [...] .buttons .button` (line 1975 in common.css.scss)
* Add `display: inline-block` attribute on each element inside the div container with class `message-buttons buttons`

![patch](https://f.cloud.github.com/assets/1282371/1949799/44ee772c-8122-11e3-8a53-03aa4849a020.png)

I forgot, on page "http://www.openstreetmap.org/user/USERNAME/inbox" solve the problem by adding an extra space (table) as I did.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/677#issuecomment-32712078
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