Updated dockerfile
Created new env variable for hanlon_subnets which is required when running Hanlon in a docker container.
Merge pull request #298 from jcpowermac/fb/update-dockerfile-297

Updated dockerfile
Changes in gemfile
New versions of grape and grape-swagger seemed to have broken Hanlon.  Forced the older version
incorrect gemfile syntax
Missed comma
Merge pull request #302 from jcpowermac/tb/fix-grape-version

Resolved grape erors