Updated changelog
UI: Separated checkbox for IPv6 enablement.

All references to old forwarding flag were renamed to forward_v4. E.g.
RoutingClass::Forward -> RoutingClass::Forward_v4 and similarly in other
cases.

Also some cleanup work is present. Mainly removing blank lines.
Added backend for separated IPv6 enablement and some cleanup. bnc#572202

Cleanup is related to YCP -> Ruby conversion.
Minor update in old testsuite to keep things working.
Created new spec for Routing.
Removed dead code from services/routing.rb
Removed some artifacts from YCP->Ruby conversion from services/routing.rb
Extended new tests for routing.

Added more tests on Routing#WriteIPForward.
It covers tests from old testsuite now.
Style guide adoptions
Adapted help for IP forwarding
AY profile: splitted ip_forward into ipv4_forward and ipv6_forward
Updated routing spec according extended AY profile.
Adapted CLI
Adapted old testsuite to reflect changes in AY profile.
Style guide adaptions
Updated gitignore
Updated spec
remove useless README
add copying