s/global_growth/global-growth/

`lein new clojurebridge global-growth` creates a top-level directory
named "global-growth". This commit tweaks the `cd` argument to match.
clarify namespace workflow
fix for issue #54 plus some reorganization, removed into which didn't have an example and more info on exercises
added file
fixed formatting
added some more examples of data structures and how to use them
incorporated feedback from Norman
removed another comma
ordered some of the examples differently
tightening the language around the last assignment
added links to docs
updated links to docs to be newer site
Merge pull request #96 from davidchambers/typo

s/global_growth/global-growth/
fix for #100 a cheatsheet of syntax and major points for reference
add Git installation instructions for OS X
incorporated feedback
refered back to functions.md where we first cover Map function
updated with suggestions from review
Merge pull request #101 from AustinClojure/fix_for_issue_54

Fix for issue 54
Merge pull request #103 from AustinClojure/fix_cheatsheet_100

Fix cheatsheet 100