Take the project description from the project main module.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

setup.py.tmpl

@@ -83,7 +83,7 @@ setup(
         'Topic :: Internet :: WWW/HTTP :: WSGI :: Application',
         'Topic :: Communications :: File Sharing',
     ],
-    description='Free Open Source Electronic Document Management System',
+    description=mayan.__description__,
     include_package_data=True,
     install_requires=install_requires,
     license='Apache 2.0',