Remove WoSign and StartCom

They were disqualified by Chromium for failure to incorporate SCTs:

	https://groups.google.com/a/chromium.org/forum/#!msg/ct-policy/W1Ty2gO0JNA/ZbQxlgRZAQAJ

	https://groups.google.com/a/chromium.org/forum/#!msg/ct-policy/UcCqlxuz_1c/Mf_939xYAQAJ

and as of this commit more than 24 hours have passed since the last STH.

Closes: #28

logs.go

@@ -92,16 +92,6 @@ var DefaultLogs = []LogInfo{
 		Url: "ct.googleapis.com/skydiver",
 		MMD: 86400,
 	},
-	{
-		Key: mustDecodeBase64("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAESPNZ8/YFGNPbsu1Gfs/IEbVXsajWTOaft0oaFIZDqUiwy1o/PErK38SCFFWa+PeOQFXc9NKv6nV0+05/YIYuUQ=="),
-		Url: "ct.startssl.com",
-		MMD: 86400,
-	},
-	{
-		Key: mustDecodeBase64("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEzBGIey1my66PTTBmJxklIpMhRrQvAdPG+SvVyLpzmwai8IoCnNBrRhgwhbrpJIsO0VtwKAx+8TpFf1rzgkJgMQ=="),
-		Url: "ctlog.wosign.com",
-		MMD: 86400,
-	},
 	{
 		Key: mustDecodeBase64("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEjicnerZVCXTrbEuUhGW85BXx6lrYfA43zro/bAna5ymW00VQb94etBzSg4j/KS/Oqf/fNN51D8DMGA2ULvw3AQ=="),
 		Url: "ctlog-gen2.api.venafi.com",