Added generic All and Any objects to sipsimple.util

Ignore-this: c8c1c0c746b8e833d379c25e50fb9c2e

darcs-hash:20100831140714-1e3d8-8d1d67f5322ec322a1c506a3c16899e9f3d5ac6b
Added timestamp to sipsimple.util.Command objects

Ignore-this: bd97ac951c7e7c644d5c156eebf88f65

darcs-hash:20100831140717-1e3d8-45b8ba6fd4b29dce2e52711457113f008f556039