Bitcoin/Litecoin Ticker Alarm

Update in v0.39:
Updated Huobi ticker API address.
更新火币价格地址。

Update in v0.38:
A small bug about Huobi is fixed.
修复火币的一个小bug。

Update in v0.37:
Opens the corresponding bitcoinwisdom chart when the user clicks the extension icon.
当用户单击工具栏价格图标的时候，打开对应货币的 bitcoinwisdom k线图。

Update in v0.36:
1. Changed the way the badge text is displayed.
2. Added support of litecoin price tickers.
更新了工具栏图标上的价格标签显示方式。增加莱特币的价格显示。

支持如下交易所的比特币/莱特币价格显示：
Huobi, OKCoin, BTCChina, Bitstamp, Bitfinex, BTC-E

使用方法：
1. 安装本扩展。
2. 价格会显示在Chrome的扩展工具栏上，缺省每15秒更新一次。
3. 在本扩展“选项”里可以设置报警闹铃，有“高于某价格报警”和“低于某价格报警”两个闹铃。如果某闹铃设为0，则此闹铃禁用。

Supported BTC/LTC exchanges:
Huobi, OKCoin, BTCChina, Bitstamp, Bitfinex, BTC-E

Usage:
1. Install this extension.
2. The price will show as a badge over the extension icon, refreshed every 15 seconds.
3. Set "high price alarm" and/or "low price alarm" in the "Options" page (via the right-click menu on the extension icon). Set to 0 to disable the alarm.

This extension is based on ryaneof's simple-bitcoin-ticker (https://github.com/ryaneof/simple-bitcoin-ticker). I added the alarm function.