Remove relative links in README.md

Removes relative links to avoid confusión when they fail

github/markup#101

README.md

@@ -53,12 +53,12 @@ latest PHP version whenever possible.
 
 ### INSTALLATION
 
-Please see [INSTALL.md](INSTALL.md).
+Please see INSTALL.md.
 
 ### CONTRIBUTING
 
 If you wish to contribute to Zend Framework 2.0, please read both the
-[README-DEV.md](README-DEV.md) and [README-GIT.md](README-GIT.md) file.
+README-DEV.md and README-GIT.md file.
 
 ### QUESTIONS AND FEEDBACK
 
@@ -81,7 +81,7 @@ the fw-announce mailing list by sending a blank message to
 ### LICENSE
 
 The files in this archive are released under the Zend Framework license.
-You can find a copy of this license in [LICENSE.txt](LICENSE.txt).
+You can find a copy of this license in LICENSE.txt.
 
 ### ACKNOWLEDGEMENTS