Allow specifying broadcast address for DHCP server to use. Default operation is unchanged.
fixes psychomario/PyPXE#25
Merge pull request #28 from ibobbitt/dhcp-broadcast

Add option for DHCP broadcast address
URLs are made incorrectly. They were ending up like ```http://192.168.2.2pxelinux.0``` (without a ```/``` in the middle).
Merge pull request #29 from ibobbitt/dhcp-typo

URLs are made incorrectly.
Merge pull request #15 from psychomario/master

update from original