* add base for config
* fixed format
* rm terminal width
* support multiple & recursive base
* add test case
* fix format
* add test construct
* minor fix
* add more test, rewrite merge from opt
* avoid depulicate keys
* delete imported config as module
* rename merge_from_dict
* add yapf and isort to travis
* minor formatting
* remove blank lines
* skip unit tests for progressbar when python2
* update travis to ubuntu 16.04
* use a newer version ffmpeg
* add -y to add-apt-repository