Merge pull request #1 from dannyrscott/master

Update Node.js to latest version
Update Berksfile
Update wercker-box.yml

- Refactor to remove a apt-get update 
- Add -y to apt-get install nodejs
Update wercker-box.yml
update for node, optipng & postgres-client
removed: chef 10.x box depenecy and use our own

also updated: wercker-essentials cookbook reference
show optipng version information
install curl
update first
fix: if statement as a signle line
tar command added
improved optipng install cleanup
update package information for phantomjs
install checkinstall
temporary disable other installs (except optipng)
apt-get added
add -y option for checkinstall
enable full provision script and show npm version
enable postgres purge again

(Before installing updated software)
official 1.0.2 release

added: chef@11.12.4 package information