Merge pull request #2 from aisapatino/master

Typo in Gruntfile.js
regenerate book after pr #2 @aisapatino
add unit testing chapter
add unit test chapter to summary
regenerate public
fix typo in unit testing chapter
update unit testing
addig superagent testing
day eight, mongo, mongoose and rest
Merge pull request #4 from tylermorgan86/master

day8 rest mongo and mongoose
update public with day 8
fix typos and missing test param
use findOneAndUpdate instead of Update so that the updated note can be returned (makes the update test pass)