Update README
+ particular support public api v3 (beta)
* DateTime structs marked as UTC
Merge remote-tracking branch 'DmT021_origin/master' into DmT021_merge

Conflicts:
	ApiTest/Program.cs
	BtceApi/BtceApi.cs
	BtceApi/TradeInfo.cs
	BtceApi/UnixTime.cs
	README
+ move classes BtcApiV3, TradeInfoV3, WebApi to separate files
* update README.md to reflect V3 examples