Added lookup_xcap_server method to DNSLookup

Ignore-this: b8261dc1dc06f0924b2395390c9aba3f

darcs-hash:20100831140733-1e3d8-aabe8b5cc49e34fdcc4967a9b3e5e92f476d437f
Added sipsimple.xcap package

Ignore-this: 985d5ce94e7a044897455b46c59abcc7

darcs-hash:20100831140958-1e3d8-ac668dda0b7cbd6a44723ebdb4dd3dd471ce7ac6