{
	"head-start": [
		"<title><%= data.name %></title>",
		"<% _.forEach(data.config.extraScripts.before, function (script) { %><script type=\"text/javascript\" src=\"<%= script %>\"></script><% }); %>"
	],
	"head-end": [
		"<% _.forEach(data.config.extraScripts.after, function (script) { %><script type=\"text/javascript\" src=\"<%= script %>\"></script><% }); %>"
	],
	"body": []
}
{
	"head-start": [
		"<title><%= data.name %></title>",
		"<% _.forEach(data.config.extraScripts.before, function (script) { %><script type=\"text/javascript\" data-extrascript=\"before\" src=\"<%= script %>\"></script><% }); %>"
	],
	"head-end": [
		"<% _.forEach(data.config.extraScripts.after, function (script) { %><script type=\"text/javascript\" data-extrascript=\"after\" src=\"<%= script %>\"></script><% }); %>"
	],
	"body": []
}
Add extra data on extrascripts injected to the test page
Add extra data on extrascripts injected to the test page

This commit adds extra data attributes on `<script>`s injected into test
page via `extraScripts` attester config, so that they can be propagated
further by a test submodule (for instance injected into subframes via
AT Classic Test Runner when running tests in isolated mode)

Close #121
