Update read me with new install instructions

Describe the new branching model (develop and master)

README.rst

@@ -11,24 +11,33 @@ pygccxml is a specialized XML reader that reads the output from GCCXML. It provi
 Install
 -------
 
-The package uses the Python distutils so you can do the usual procedure:
+You can use pip to install pygccxml:
 
-  python setup.py install
+  pip install pygccxml
+
+To install from source, you can use the usual procedure:
 
-For more information about using the distutils see the Python manual
-"Installing Python Modules".
+  python setup.py install
 
 Contact us
 ----------
 
-You can contact us through the gccxml mailing list: http://www.gccxml.org/mailman/listinfo/gccxml .
-For issues with pygccxml you can open an issue here: https://github.com/gccxml/pygccxml/issues .
+You can contact us through the gccxml mailing list: http://www.gccxml.org/mailman/listinfo/gccxml
+
+For issues with pygccxml you can open an issue here: https://github.com/gccxml/pygccxml/issues
 
 Documentation
 -------------
 
 For examples and tutorials see the documentation: http://gccxml.github.io/pygccxml/
 
+Branches
+--------
+
+The stable version can be found on the master branch.
+
+The develop branch containes the latest improvements but can be unstable. Pull Requests should be done on the develop branch.
+
 Testing and code coverage
 -------------------------