Initial commit. Sofia SIP is cloned from git://gitorious.org/sofia-sip/sofia-sip.git, commit 8cb7baaab77fc3af351262933f0ae113d591fba1
Changes in order to cross compile for iOS without errors. Apparently, the network change functionality works for OSX but not for iOS
Introduced test-ios-sip-sofia sample xcode project that uses sip sofia to send an instant message to a server UA.