Merge pull request #2 from westonplatter/master

[professional javascript] ch1 and ch2 structure + formatting
Merge pull request #3 from westonplatter/master

[professional javascript] finish ch5 and start ch6
Added Mac alternative for brew for installing Node.js.
Merge branch 'master' of https://github.com/denvercodeclub/learning_javascript
Ignore IntelliJ IDEA project files/directories.
Use markdown link syntax for link I added previously. Playing with git a bit too (command-line and IDEA).
simplified the README setup instructions
> described the 2 setups in terms of options
> described the node and git install options