fixing issue #77 - adding property validiation to raven config object when setting dsn

AUTHORS

@@ -8,4 +8,5 @@ Arthur Darcet- https://github.com/arthurdarcet
 lesterkp - https://github.com/lesterkp
 Christoph Lupprich - https://github.com/clupprich
 Dmitry Vorobyov - https://github.com/dvor
-Mark Anderson - https://github.com/manderson-productions
+Mark Anderson - https://github.com/manderson-productions
+Marc Doering - https://github.com/triskybro

Raven/RavenConfig.m

@@ -48,6 +48,10 @@ - (BOOL)setDSN:(NSString *)DSN {
     self.publicKey = [DSNURL user];
     self.secretKey = [DSNURL password];
 
+    if (!self.serverURL || !self.publicKey || !self.secretKey) {
+        return NO;
+    }
+
     return YES;
 }