Security Beret + Jumpsuit Sprites

After some indepth discussion with people in game and in steam, which many people have voiced their dislike of the new sprites, I've decided to test the waters with a few sprite changes, in the hope of reaching a equal ground with the current security image problem.

Link to relevant PR: https://github.com/tgstation/-tg-station/pull/6317

What people like Paprika and MrPerson have expressed is that they are concerned with the image Sec Officers give away, and I think Paprika's PR failed to properly address that problem.

I'm not doing a full sprite revert as of now.

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The changes in this PR are as follows..

* Security Officers now start with a Beret equipped.
* The Beret has been buffed to have identical defence values to the normal helmet (discussion is needed here).
* Ausops's Jumpsuit sprites have been made the standard issue, with the kneepads removed as per MrPerson's request.

Here is a image of how Officers will look like, both at round start and with their standard equipment.

![screenshot 2014-12-15 18 40 03](https://cloud.githubusercontent.com/assets/6595389/5434235/8edaba8c-848a-11e4-855b-4b0869db8db6.png)

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I'm not expecting this to be merged, but I do wish to better consolidate feedback on this issue on this PR. As well as the relevant forum thread.

Thank you.