Merge branch 'feature/header-accept-type' into develop

Author: stigi

Sources/OAuth2Client/NXOAuth2Client.h

@@ -67,6 +67,7 @@ extern NSString * const NXOAuth2ClientConnectionContextTokenRefresh;
 
 @property (nonatomic, copy) NSSet *desiredScope;
 @property (nonatomic, copy) NSString *userAgent;
+@property (nonatomic, copy) NSString *acceptType; // defaults to application/json
 
 @property (nonatomic, strong) NXOAuth2AccessToken    *accessToken;
 @property (nonatomic, unsafe_unretained) NSObject<NXOAuth2ClientDelegate>*    delegate;

Sources/OAuth2Client/NXOAuth2Client.m

@@ -91,6 +91,8 @@ - (id)initWithClientID:(NSString *)aClientId
         tokenType = [aTokenType copy];
         accessToken = anAccessToken;
 
+        self.acceptType = @"application/json";
+        
         self.persistent = shouldPersist;
         self.delegate = aDelegate;
     }

Sources/OAuth2Client/NXOAuth2Connection.m

@@ -197,6 +197,10 @@ - (NSURLConnection *)createConnection;
         [startRequest setValue:client.userAgent forHTTPHeaderField:@"User-Agent"];
     }
 
+    if (client.acceptType) {
+        [startRequest setValue:client.acceptType forHTTPHeaderField:@"Accept"];
+    }
+    
     NSURLConnection *aConnection = [[NSURLConnection alloc] initWithRequest:startRequest delegate:self startImmediately:NO];    // don't start yet
     [aConnection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];    // let's first schedule it in the current runloop. (see http://github.com/soundcloud/cocoa-api-wrapper/issues#issue/2 )
     [aConnection start];    // now start