More awesome fonts
Removed sequential? and associative? functions

Not necessary for this course.
Also added a better description of vectors. Fixes #49.
merge conflict
Added diagram for map data structure

Fixes #50
Finish slides for module 2
add Heroku SSH setup
add heroku ssh images
Add for section to data structures
Merge remote-tracking branch 'upstream/master'
Added for to slides
Merge pull request #56 from mrwhelan/master

Fixed issue #21 by adding to OS X install instructions
Merge remote-tracking branch 'upstream/master'
Fix web section typos to fix Issue #43
Add clarifications to web section to fix Issue #44
Fix formatting problem in web section
Merge pull request #57 from bridgethillyer/master

Add for section to data structures
Fix font errors
Expand slides on for
Add empty shells for modules 3, 4, and 5