Added badge colors, removed YQL proxy, added several trading pairs

+ Added badge colors to indicate if the price has gone up or down
+ Removed YQL proxy (extension now gets its prices from the exchange
tickers itself)
+ Added the following trading pairs:
+ BTC-e (USD)
+ BTC-e (EUR)
+ BTC-e (RUB)
+ Bter (CNY)
+ Cavirtex (CAD)
+ Coinbase (USD)
+ Vault of Satoshi (USD)
+ Vault of Satoshi (CAD)