allow users to disable gravatar.
Merge pull request #228 from Snorby/development

allow users to disable gravatar.
use onerror due to gravatar api change
fix password reset form by not using shared ID
Update sensor controller index render formats
Create sensor index js
Create _sensors.html.erb
update
updates for rails graph / vulnerability fixes.
Merge branch 'development' of github.com:Snorby/snorby
version bump
Merge branch 'master' into demo

Conflicts:
	public/assets/snorby.css
	public/assets/snorby.css.gz
	public/assets/snorby.js
	public/assets/snorby.js.gz