Port 18080 should be open when launch as default

[xiandong79]

port 18080 is the history-sever which is very important.

[palatinuse]

I think the patch would be to add the following lines after line 570 in flintrock/ec2.py:

SecurityGroupRule(
            ip_protocol='tcp',
            from_port=18080,
            to_port=1808,
            cidr_ip=flintrock_client_cidr,
            src_group=None),

Any thoughts on that?

[nchammas]

I haven't looked closely at this issue, but yeah, that seems reasonable to me. Feel free to submit a PR and I'll take a closer look.