Add Press Center with resources, FAQ and interviewees

Bitcoin is getting more attention, but the lack of good press resources have a bad impact on the quality of the press coverage. We've worked hard to fix this problem. This pull requests add Press Center to the website that covers these needs. The result can be seen live here : http://bitcoinpress2.us.to/en/bitcoin-for-press

The Press Center adds the following content to the website :

**Potential interviewees**
Bring back the press mailing list that was in the home page in the previous website. Along with a nice presentation for many individual interviewees.
**Facts, FAQ and Myths**
To address most recurring questions in the media and fight against inaccurate myths.
**Materials**
Nice quality videos, pictures and quotes media can freely use.
**Press coverage**
To offer a reference to existing good interviews that we feel covers Bitcoin with a good level of accuracy.

The whole project was initiated by Mike Hearn and received the help and support of a team of involved people, including myself : https://groups.google.com/forum/#!members/bitcoin-press-team .