README and CREDITS updates.

CREDITS.md

@@ -27,5 +27,9 @@ Contributors to Magnum library
     Debian package
 *   Olga Turanksaya ([@olga-python](https://github.com/olga-python)) -- Gentoo
     ebuild
+*   [@wivlaro](https://github.com/wivlaro) -- numerous bug reports, Mac OS X
+    fixes, feature improvements
+*   Squareys ([@Squareys](https://github.com/Squareys)) -- bug reports,
+    documentation improvements
 
 Big thanks to everyone involved!

README.md

@@ -162,6 +162,8 @@ separate repositories.
 *   **libRocket integration** -- integrates Magnum as rendering backend into
     [libRocket](https://github.com/libRocket/libRocket) GUI library:
     https://github.com/miguelmartin75/Magnum-libRocket
+*   **Magnum Inspector** -- Gtk-based inspector window running alongside Magnum
+    https://github.com/wivlaro/magnum-inspector
 
 CONTACT
 =======