Merge pull request #5 from tronza/fixes-to-content

Added linebreaks to make the document cleaner
add chapter3 description
Merge branch 'master' of https://github.com/tronza/hy-javascript-programming into add-chapter3-description
add chapter3 description
Merge pull request #6 from tronza/add-chapter3-description

Add chapter3 description
Added more content