Compress spaces in submission titles

This patch simply runs `spaceCompress()` from `filters.py` on the submission title.

Helps with API clients to prevent crazy formatting like this:
![F6oqXSP](https://f.cloud.github.com/assets/87961/314224/88c6430e-97c5-11e2-8c04-c32afb1bc4a0.png)

Of course the alternative is to handle whitespace compression on the client side, but when 99% of posts have well-formatted titles, it's easy to get blindsided by the rare one that doesn't.