modified source directory structure
  - files for production files
  - samples for sample files (not installed in final build)
modified Makefile
  - separate options for additional provider scripts
  - remove comments and empty lines from final build
add IPv4 100.64/10 (RFC 6598) and 169.254/16 (RFC 5735) to the range of default blocked IP's.
new option "bind_network" to force GNU Wget or cURL to use specific network/interface for communication
new "domains.google.com" as IPv4 DDNS provider #822

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

restructure startup of dnymaic_dns_updater.sh
 - first run load_all_config_options (it returns 1 if SECTION_ID not found) #779
 - set all defaults if necessary
 - verify if username and/or password is needed inside update_url #779
 - remove wait - will be done by retry_interval and retry_count if communication fails
provider specific update scripts
 - verify if username/password are needed
services_ipv6
 - added freedns.afraid.org
 - IPv6 should work due to their documentation
minor fixes

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

- moved /usr/lib/ddns/dynamic_dns_lucihelper.sh from luci-app-ddns into this package
	(Github openwrt/luci issue 251)
	(OpenWrt Trac tickets 18326 18347)
- fix: dynamic_dns_update.sh did not loop
	(OpenWrt Trac ticket 18336)
- add provider cloudflare.com IPv4 and IPv6 (Thanks to Paul for support and testing)
	(OpenWrt Trac ticket 12500)
- modified detection, if dynamic_dns_fuctions are used by dynamic_dns_lucihelper.sh
- redirect stdout of wget,curl,host,nslookup,nc etc to /tmp/ddns_$$.dat and *.err instead of variables
- extended error detection in get_local_ip function
- modified verify of option ip_script to allow parameters, when calling
- add provider selfhost.de IPv4
- add provider no-ip.pl (nothing to do with no-ip.com)
	(Github openwrt/packages issue #542)
	IPv4 (tested) and also added for
	IPv6 (NOT tested) because client IP is autodetected be provider
- add getlocalip_sample.sh as sample script for usage of
	option ip_source 'script'  together with
	option ip_script '/usr/lib/ddns/getlocalip.sh -4'
- cleanup whitespaces at line ends

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

- fixed postinst and prerm in Makefile
- implementation of provider specific update scripts into services and
services_ipv6 file.
	first Provider "no-ip.com"	- Thanks to DarkStarXxX for
request and testing
- finished uci/ddns wiki at http://wiki.openwrt.org/doc/uci/ddns
- rewritten retry management
- rewritten logging including following Issue 469
	https://github.com/openwrt/packages/issues/469
- stop running sections on hotplug ifdown event (like start on ifup)
- implement trap detection
	also kill "sleep" child processes
	SIGHUP to reload configuration (not really reloading, simply
starting a new process)
	/etc/init.d/ddns reload implemented
- code optimization
- new provider LoopiaDNS.se	Issue 494
	https://github.com/openwrt/packages/issues/494

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>