[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
Require bundler >=1.5.0 and add back x64_mingw and mingw to the tzinfo-data dependency.

This fixes #278.

Remove an unnecessary //i flag while at it.
Upgrade to Bootstrap 3.1.1
Forgot sign up form!
in the AddEventIdAtCreationToLinks migration, handle the case of links that don't yet have any events
actually save the link
truncate log messages to 2048 characters
add Link, Event classes to migration and use find_each
Merge pull request #306 from cantino/truncate_agent_log_messages

truncate log messages to 2048 characters