两个步骤，记录如下，主要用在silverlight中引用的dll要签名时：
"C:Program FilesMicrosoft SDKsWindowsv6.0ABinildasm.exe" .RestSharp.dll /out:.SignedRestSharp.il "C:WindowsMicrosoft.NETFrameworkv2.0.50727ilasm.exe" .SignedRestSharp.il /dll /key=.RestSharp.snk /output=.SignedRestSharp.dll