Turned the header image in readme.md into a link.

Updated all links to use https (tested).

src/SFML/System/Unix/ThreadImpl.cpp

@@ -65,7 +65,7 @@ void ThreadImpl::terminate()
         #ifndef SFML_SYSTEM_ANDROID
             pthread_cancel(m_thread);
         #else
-            // See http://stackoverflow.com/questions/4610086/pthread-cancel-al
+            // See https://stackoverflow.com/questions/4610086/pthread-cancel-al
             pthread_kill(m_thread, SIGUSR1);
         #endif
     }

src/SFML/Window/Android/WindowImplAndroid.cpp

@@ -418,7 +418,7 @@ int WindowImplAndroid::processKeyEvent(AInputEvent* _event, ActivityStates* stat
         if (key == AKEYCODE_UNKNOWN)
         {
             // This is a unique sequence, which is not yet exposed in the NDK
-            // http://code.google.com/p/android/issues/detail?id=33998
+            // https://code.google.com/p/android/issues/detail?id=33998
             return 0;
         }
         else if (int unicode = getUnicode(_event)) // This is a repeated sequence

src/SFML/Window/OSX/HIDInputManager.mm

@@ -694,7 +694,7 @@ Keyboard::Key HIDInputManager::localizedKeys(UniChar ch)
 ////////////////////////////////////////////////////////
 Keyboard::Key HIDInputManager::nonLocalizedKeys(UniChar virtualKeycode)
 {
-    // (Some) 0x code based on http://forums.macrumors.com/showthread.php?t=780577
+    // (Some) 0x code based on https://forums.macrumors.com/showthread.php?t=780577
     // Some sf::Keyboard::Key are present twice.
     switch (virtualKeycode)
     {

src/SFML/Window/OSX/SFViewController.mm

@@ -254,7 +254,7 @@
     if ([NSThread currentThread] != [NSThread mainThread])
     {
         /*
-         * See http://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
+         * See https://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
          * for more information.
          */
         sf::err() << "Cannot fetch event from a worker thread. (OS X restriction)" << std::endl;

src/SFML/Window/OSX/SFWindow.h

@@ -40,7 +40,7 @@
 /// acceptsFirstResponder and canBecomeKeyWindow messages must
 /// return YES to grab fullscreen events.
 ///
-/// See http://stackoverflow.com/questions/999464/fullscreen-key-down-actions
+/// See https://stackoverflow.com/questions/999464/fullscreen-key-down-actions
 ///
 /// \return YES
 ///

src/SFML/Window/OSX/SFWindowController.mm

@@ -136,7 +136,7 @@
     if ([NSThread currentThread] != [NSThread mainThread])
     {
         /*
-         * See http://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
+         * See https://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
          * for more information.
          */
         sf::err() << "Cannot create a window from a worker thread. (OS X limitation)" << std::endl;
@@ -566,7 +566,7 @@
     if ([NSThread currentThread] != [NSThread mainThread])
     {
         /*
-         * See http://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
+         * See https://lists.apple.com/archives/cocoa-dev/2011/Feb/msg00460.html
          * for more information.
          */
         sf::err() << "Cannot fetch event from a worker thread. (OS X restriction)" << std::endl;

src/SFML/Window/Win32/WglExtensions.txt

@@ -10,4 +10,4 @@ WGL_ARB_multisample
 WGL_ARB_pixel_format
 WGL_ARB_pbuffer
 WGL_ARB_create_context
-WGL_ARB_create_context_profile
+WGL_ARB_create_context_profile