Removed unused imports in sipsimple.applications

Ignore-this: cc480132b4b78eaad7e668cfafb82a9c

darcs-hash:20090329233456-1e3d8-93608f6409042cde13502d2e10d95edd897ce633
Removed unused import in sipsimple.lookup

Ignore-this: e9b657cc484a5b5a1de5410ee316c875

darcs-hash:20090329233538-1e3d8-40d53863a181e7c9f4a60b7ac4aad9325fe4214b