Made use of cjson module in test/xcap_manager.py rather than json

Ignore-this: 44391d5ca5c950fb5ee1a87dd602b0a

darcs-hash:20100831161039-1e3d8-7574650a4ccd575838663ddd79f09fcece4ba01c
Improved changelog

Ignore-this: d9185260089804061bd62ac6d728308a

darcs-hash:20100831165530-58252-8ae660cddafb04dc619faf7f337c491db2b013fe