Merge pull request #1 from cindeem/master

Small edits to first set of intro docs
Updated README to have google slides
Finished converting control flow notebook from SC
Added data_structures notebook from SC
Wrote my own notebook for lists+funcs
Wrote my own intro to functions
Fixed numbering for Lists and Functions
Added data files for File notebook
Fixed name of Loops notebook
Finished revisions for Day 3
Added a notebook on classes