Converted BitFloor to blockchain because BitFloor shutdown.

Set User-Agent header to Mozilla for Bit24 (They were blocking the request before)

Changed Bit24 json key from last (Everything but last returns null from the bit24 API)

Switched to use BTC-e API rather than screen scraping
Bit24 was returning a rate of ~87.00, I found they closed so switched to Bitstamp
Small formatting changes