Added Bitcoin-Central, Bitpay, BTC-E, Coinkite, and Eclipse Mining Consortium

Also corrected capitalization. See #448
Added logos
Merge pull request #1 from mxxcon/bitcoins

Added logos
Added logos as per #449
Merge pull request #449 from jamcat22/patch-3

Added Bitcoin-Central, Bitpay, BTC-E, Coinkite,