Fix error handling
Add upper case letters to dpid format
Also "0X" should be allowed
Fix node api issue
Merge pull request #214 from axsh/fix-api-spec

Fix api spec
Merge remote branch 'origin/master' into refactor-port-manager

Conflicts:
	vnet/lib/vnet/endpoints/1.0/datapaths.rb
Cleaned up how default gw is found.