adding images to assets folder for lesson 7
adding lesson 8 folder and assets
Adding lesson 9 folder
Update install_instructions.md

removed $ for prompts... confused people.
Merge remote-tracking branch 'upstream/master'
Removing extra install_instructions
Adding answers to lesson 1 exercises
Updating slides to have links to answers
Merge pull request #6 from bswinnerton/master

Adding answers
added code-alongs and exercises for lesson 2
add slides for lesson 2