Added DHCP Packet Parser And Generator.
Added DHCP Packet Parser And Generator.
Fixed order of example
Merge branch 'pull_request' of git://github.com/shun159/pio into feature/dhcp

Conflicts:
	README.md
	lib/pio.rb
	lib/pio/util.rb
Fix rubocop warnings.
Marked failed tests as pending (refs #22).