fixes bug 977216 - Symbols upload by HTTP or web form

@rhelmer r?

What this does it makes a page under `/symbols/` (no link to it yet) that makes it possible to upload symbols files. When you get there, there are instructions for how to do it by API (using API Tokens) for both Python and cURL. As part of the review, I'd strongly encourage that you actually test that out fully. 

![screenshot 2014-02-27 16 16 26](https://f.cloud.github.com/assets/26739/2289764/94d3fc8a-a00d-11e3-80e8-08e48619fcf1.png)