Merge pull request #75 from BluesFiend/master

small tweak to cli intro as windows can also use mkdir to remove confusi...
Editorial changes to Intro to Command Line
Update README.md
Merge pull request #76 from MarysiaLowas/master

Editorial changes to Intro to Command Line
Added dictionaries in the introduction to Python
Merge pull request #77 from deeptiGuptaUIUC/master

Added dictionaries in the introduction to Python
Adding in example of error when user becomes logged out and tries to create a post
Merge pull request #78 from BluesFiend/master

Adding in note re logged in user missing during post creation
Merge branch 'hotfix/directory_consitency'
merging