Correctly distinguish between Dell and Juniper devices

Unfortunately there's not much info we can get from the Dell iDrac
HTML page as it's ridden with JavaScript.
No need to add the server family explicitly
nexthostname command - fix
Re-attach IP address after cleaning a host
Merge github.com:allegro/ralph
Don't try to repeat the clean plugin
reboot plugin - now always return True
added django-bob 1.5.0
Merge pull request #355 from wmatyskiewicz/patch-1

added django-bob 1.5.0
Fixed concurrent_get_or_create for puppet plugin. When mount_point is not known, disable unique_together for (device, mount_point)
Pep8 for file
Merge pull request #356 from vi4m/puppet_fix

Fixed concurrent_get_or_create for puppet plugin.
Merge pull request #354 from andrzej-jankowski/master

reboot plugin - now always return True
Remove Venture.netwroks, VentureRole.networks and check_ip
merge
Merge branch 'master' of git://github.com/allegro/ralph into dev
deleted devices - searching fix
deleted devices searching - minor code improvement
Fixed incorrect handling of position, when no Network recognizes given ip address.
Fixed concurrency bug in hp_oa