[#8] Create Error display solution

	1. Errors collection -> local collection that stores our errors
		1. throw() -> How user inserts errors into collection - Errors.throw(error.reason);
		2. clearSeen() -> Remove all 'seen' errors from collection.
	2. Errors templates
		1. errors - Container for all errors. Renders 'error' template for each error item.
		2. error - Single error template
	3. errors template helper
		1. errors - grab all errors from Errors collection
	4. error template on render - set 'seen' to true.
	5. Updated focusItem and FocusModal Meteor Method calls to use Errors.throw(error.reason) when there is an error rather than alert(error.reason)