formatting changes
Merge branch 'backend' into flask

Tool liwen's file and basically did some small formatting changes

Conflicts:
	data_interface/__init__.py
added testing files. removed "file" reference (name conflict/ambigious) --> filename
set the default service
added a file item as a default to test
added DS-Store
ignore ds-store
chg filename to filelist
change to filedict
added db to list
adding tests for data_interface
added bootstrap preview
added publish to preview
added remove_comment test
removed ~ in gitignore