pep 8
Merge remote-tracking branch 'allegro/develop' into dns_and_dhcp_forms
Added ci_link and impact_link to REST API
additional validation in dns fors - one ptr record is required
Fixes
Merge pull request #723 from quamilek/develop

Travis-CI fix run test command
default deprecation rate in settings
additional validation in dns form - fix
Removed spurious blank line
show_in_ralph field added to api_pricing
datepicker on input fix
DHCP form - additional validation
add dhcp_broadcast to Noetwork model
Merge pull request #725 from mkurek/feature/add-fields-to-api-pricing

Feature/add fields to api pricing
Merge pull request #724 from mkurek/feature/default-deprecation-rate

Default deprecation rate in settings
Merge pull request #721 from zefciu/api-small-changes

Api small changes
new networks dhcp config generator
dhcp conf head generation - fix
fixes and flakes
get_subnetworks method and tests for next_free_subnet