Merge pull request #7 from paulzerkel/master

add support for nodejs 6

Fix: both numeric and string forms are now acceptable for nodejs_version variable.

Add: support Node.js 5.x and 4.x under CentOS/RHEL.

Fix: with_items syntax for Ansible 2.x + Ubuntu 14.04

Fix: NodeSource node_4.x only applicable to more recent Debian/Ubuntu distributions

Update: default = 0.12 for Ubuntu/Debian.

Add: support 4.x

Add: support io.js 3.x

Merge pull request #2 from therealmarv/fixed-gpg-key

Change: license statement in role's metadata.

Change: license from Apache V2 to MIT.

use a one time downloaded gpg key

Update: simplify circle.yml to leverage CircleCI's upgrading to Docker 1.6.2

Add: CircleCI