Adding new checkpoints
Adding Google exchange rates

This uses a google spreadsheets hack to provide exchange rate data
using the Google APIs.  It seems work very well.

Relevant to #29
3.30.5
fix the Chinese Translation from "比特幣"(bitcoin) to "萊特幣"(litecoin).
Merging new Chinese translation strings

Merge branch 'messy' of github.com:kevinwatt/bitcoin-wallet into messy