Merge pull request #15 from ckgczarzar/develop

Add db's backup method.
Add voluptuous in setup.py
Merge pull request #18 from imZack/develop

Add voluptuous in setup.py
Merge remote-tracking branch 'upstream/develop' into develop
Merge pull request #17 from ckgczarzar/develop

Enhancement
Resolved #7. Replace :variable in resource
Merge branch 'develop' of github.com:Sanji-IO/sanji into develop
Merge pull request #19 from imZack/develop

Resolved #7. Replace :variable in resource
Update test_router.py

- Refine something
Merge pull request #24 from imZack/develop

Update test_router.py
add pip installation packages
Merge pull request #25 from u7702045/develop

add pip installation packages
Change teardown sequence for model_initiator.py
Modify mqtt.py to use env variables.
Merge pull request #27 from imZack/develop

Change teardown sequence for model_initiator.py
Merge remote-tracking branch 'upstream/develop' into develop
replace OSError to IOError