Add non-profit organizations to the community page

This pull req can be previewed live here: http://bitcoinnonprofit.us.to/en/community

It basically add the same non-profit organizations listed on the wiki page, plus the Argentina Foundation and The Bitcoin Alliance of Canada: https://en.bitcoin.it/wiki/List_of_Bitcoin_non-profits_around_the_world

These organizations seem to invest a lot of efforts for Bitcoin and would be probably useful to many visitors, so giving them some more visibility seems like a good thing to me.