[196-Disable] DB Migration
[196-Disable] Update agent index, controller, css, etc to show disabled state
[196-Disable] Update agent _form to include disable option
[196-Disable] Update agent diagram to show disabled state
[196-Disable] Cleanup agent show menu and include disabled state
[196-Disable] Make event index delete button red
Don't run things on disabled agents

Note: Pretty sure this works (limited manual testing), if you enable an agent again and run event propagation it will process all events while it was disabled. Not sure if this is a good thing or not.. May need some way to show them and potentially clear them?
Handle disabled agents properly in bulk_check
Merge commit 'b041a51ad11135ab1bcc9f5392730659861938a2' into 196-disable-agents

Conflicts:
	db/schema.rb
Merge branch 'master' into 196-disable-agents

Conflicts:
	app/views/agents/diagram.html.erb
	app/views/agents/show.html.erb

Manually Edited:
	app/helpers/dot_helper.rb
Changes based on @cantino's comments

* Changed line-through to opacity: 0.5
* Removed 'def disable' in favour of put
* Remove disabled checkbox from form
Handle disabled agents better in dot_helper
Merge branch '196-disable-agents' of https://github.com/alias1/huginn into alias1-196-disable-agents
Merge branch 'master' into alias1-196-disable-agents

Conflicts:
	app/assets/stylesheets/application.css.scss.erb
	app/views/agents/_form.html.erb
	app/views/agents/index.html.erb
	app/views/agents/show.html.erb
	app/views/events/index.html.erb
disable run button when disabled
add specs for disabled agents
Merge pull request #314 from cantino/alias1-196-disable-agents

Alias1's Disabled Agents patch