Minor documentation updates

[rg3]

As of the time I'm writing this, documentation pages have a couple of issues:

• http://rg3.github.com/youtube-dl/faq.html still lists Python 2.5 as "supported" in the first question, directly contradicting the text in the last question.
• The copyright marks still mention 2011, while the docs have been updated and released in 2012 too (and soon 2013). Probably the copyright notices should be updated and people could be added to the list of copyright holders if needed.

Thanks for taking care of the project. :)

[phihag]

Done and done, the latter with a hilariously over-engineered script that will automatically update the copyright so we don't forget it in 2013.