[ENH] set up circle.ci and run it

[zhao-cy]

hold until scripts for more modalities added ... Then there will be a better environment for setting up circle.ci

• example mif data
• .circleci/config.yml

Also in .circleci/config.yml, should pennbbl be changed to PennLINC? --> wait until Matt & Ted talk about costs of docker and circle ci (and add Chenying)