rescued xbee2 'sensor' conType from xbeeZB_old branch (not sure why it was only there...)
updated documentation for 'new' sensor conType
added nice comments to _xbee_conLocate
started implementing changes required for xbeeZB support (taken from xbeeZB_old branch)
implemented fundamental xbeeZB support - ZDO, etc will need to be implemented separately for now (taken from xbeeZB_old branch)
added xbeeZB samples (taken from xbeeZB_old branch)
updated win32 README for clarity
Merge remote-tracking branch 'origin/xbeeZB' into win32
changed required for a clean build following merge