Support for Rubymotion

The NSDictionary that rubymotion creates from hashes doesn't seem to gel well with `indexOfObjectIdenticalTo`, perhaps something to do with the way constants are handled? This change allows CRToast to be used with rubymotion while keeping the valid key checking intact.

CRToast/CRToast.m

@@ -903,7 +903,7 @@ - (void)setOptions:(NSDictionary *)options {
     NSMutableDictionary *cleanOptions = [options mutableCopy];
     [options enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
         //Check keys validity followed by checking objects type validity
-        if ([kCRToastKeyClassMap.allKeys indexOfObjectIdenticalTo:key] == NSNotFound) {
+        if ([kCRToastKeyClassMap.allKeys indexOfObject:key] == NSNotFound) {
             NSLog(@"[CRToast] : ERROR given unrecognized key %@ in options with object %@",
                   key,
                   obj);