Update .travis.yml

Allow external
Merge branch 'release/2.0.0-stable'
Force ubuntu 14.04 hotfix
added DeviceFactory + factoryboy to setup.py
Merge pull request #1006 from xliiv/device-factory

added DeviceFactory + factoryboy to setup.py
[bulk-edit] added possibility to edit 'name', 'venture', 'role' and
'physical parent device' fields.
flake8
Updated changelog.
Merge pull request #1007 from xor-xor/ralph_1821

[bulk-edit] added possibility to edit additional fields
Merge pull request #1008 from xor-xor/changes

Updated changelog.
Updated changelog pt. 2
Updated changelog pt. 3
added filter
INSTALLED_APPS instead of PLUGGABLE_APPS
`ralph_assets` insted of `assets`
used HTTP403 template in ralph_permission util - in prog. ..
Merge pull request #1012 from ar4s/feature/search-filter-without-linked-assets

Added new filter to sidebar search
(fix) http_family for Juniper switches is now recognized properly.
Fixed broken docker autobuild for chfn
Bugfix from develop for docker building