pythonPackages: remove name attribute`

The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.

While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.

pkgs/development/python-modules/syncserver/default.nix

@@ -16,7 +16,7 @@
 }:
 
 buildPythonPackage rec {
-  name = "syncserver-${version}";
+  pname = "syncserver";
   version = "1.6.0";
   disabled = ! isPy27;
 
@@ -31,9 +31,4 @@ buildPythonPackage rec {
     cornice gunicorn pyramid requests simplejson sqlalchemy mozsvc tokenserver
     serversyncstorage configparser
   ];
-
-  meta = {
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.all;
-  };
 }