Merge pull request #5 from rayrod2030/master

Added collector name attribute which is used in the sumo.conf template
Added two user definable custom configuration cookbooks and template
attributes for sumo.json and sumo.conf.  These attributes allow someone
using the community sumologic-collector cookbook to inject their own
custom sumo.json and sumo.conf templates through custom cookbooks
directly or from a wrapper cookbook.  Included defaults mean that all
current behavior remains the same unless a user wants to introduce
custom configuration cookbooks and templates.