JasonGiedymin.nodejs: Fix SHASUM check to work for newer node.js releases which use sha256sum

[trinitronx]

To test, set vars nodejs_version and nodejs_shasum_url in playbook like this:

Note: Playbook assumes localhost is a RHEL system (pre_tasks: may not be needed, but this is an excerpt from the playbook I was testing this role in... The vars: are what's important for Node.js v4.0.0)

- name: Install Node.js
  hosts: localhost
  gather_facts: yes
  sudo: yes
  vars:
    nodejs_version: 4.0.0
    nodejs_shasum_url: http://nodejs.org/dist/v4.0.0/SHASUMS256.txt
  pre_tasks:
    - name: update packages
      yum: >
         name=*
         state=latest

    - name: install specific packages
      yum: name={{ item }} state=latest
      with_items:
        - wget
        - gcc
        - make
        - gcc-c++
        - vim
        - mlocate
        - mc
        - lsof
        - psmisc
        - bind-utils
        - epel-release
        - nc
        - git

    - name: install epel specific packages
      yum: name={{ item }} state=latest
      with_items:
        - nrpe
        - nagios-plugins-nrpe
        - unbound
        - liblockfile
        - lockfile-progs
        - perl-IPC-Signal
        - perl-Proc-WaitStat
        - perl-mime-construct
  roles:
    - JasonGiedymin.nodejs

[ninthnails]

Ansible module get_url support sha256sum checks, please see http://docs.ansible.com/ansible/get_url_module.html