Returns the certificate as a base64 encoded string if the URL Scheme is registered with Afaria.
- (NSString *) getSignedCertificateFromAfariaForURLScheme: (NSString *) urlScheme withUsername: (NSString *) username withPassword: (NSString *) password
Returns a certificate as a base64 encoded string
application:applicationDidFinishLaunchingWithOptions:to handle the URL received from the Afaria client if the Afaria settings are missing.
 @try {
        LiteSUPCertificateStore* store = [LiteSUPCertificateStore getInstance];
        NSString* certBase64 = [store getSignedCertificateFromAfariaForURLScheme:@"SCHEME" withUsername:@"UserName" withPassword:@"password"];
        NSLog(@"%@", certBase64);
    }
    @catch (NSException *exception) {
        NSLog(@"%@", [exception reason]);
    }