Added missing chat section to SIPSimpleSettings

Ignore-this: ff3568609caab3a66274c3536d6a552

darcs-hash:20090318161231-1e3d8-a1abab22e34d6a5339f96390dbe50b936795f55c
Added Request object to core for sending simple SIP requests

darcs-hash:20090318175631-58103-791a6cf456e07722ff4684992c4262e411ca2b96