fixed a handful of memory leaks

OAMutableURLRequest.m

@@ -53,7 +53,7 @@ - (id)initWithURL:(NSURL *)aUrl
     if (aToken == nil) {
         token = [[OAToken alloc] init];
     } else {
-        token = aToken;
+        token = [aToken retain];
     }
     
     if (aRealm == nil) {
@@ -127,13 +127,17 @@ - (void)prepare {
 }
 
 - (void)_generateTimestamp {
-    timestamp = [[NSString stringWithFormat:@"%d", time(NULL)] retain];
+	[timestamp release];
+    timestamp = [[NSString alloc]initWithFormat:@"%d", time(NULL)];
 }
 
 - (void)_generateNonce {
     CFUUIDRef theUUID = CFUUIDCreate(NULL);
     CFStringRef string = CFUUIDCreateString(NULL, theUUID);
     CFRelease(theUUID);
+	if (nonce) {
+		CFRelease(nonce);
+	}
     nonce = (NSString *)string;
 }
 
@@ -173,4 +177,13 @@ - (NSString *)_signatureBaseString {
             [normalizedRequestParameters encodedURLString]];
 }
 
+- (void) dealloc
+{
+	[token release];
+	[(NSObject*)signatureProvider release];
+	[timestamp release];
+	CFRelease(nonce);
+	[super dealloc];
+}
+
 @end

OARequestParameter.m

@@ -69,4 +69,9 @@ + (id)requestParameter:(NSString *)aName value:(NSString *)aValue
 	return [[[self alloc] initWithName:aName value:aValue] autorelease];
 }
 
+- (void)dealloc{
+	[name release];
+	[value release];
+	[super dealloc];
+}
 @end

OAToken.m

@@ -190,7 +190,11 @@ - (NSDictionary *)attributes {
 
 - (void)setAttributes:(NSDictionary *)theAttributes {
 	[attributes release];
-	attributes = [[NSMutableDictionary alloc] initWithDictionary:theAttributes];
+	if (theAttributes) {
+		attributes = [[NSMutableDictionary alloc] initWithDictionary:theAttributes];
+	}else {
+		attributes = nil;
+	}
 }
 
 - (BOOL)hasAttributes {