added ember-href-to performance tests

[GavinJoyce]

Here are some simple performance tests for the ember-href-to Ember cli addon.

On my machine, {{href-to}} is 12x faster than {{link-to}} in Ember 1.13.4 and 6x faster in Ember 1.11.3:

(9.44 - 7.76) = 1.68ms
(27.95 - 7.76) = 20.19ms

12x faster in Ember 1.13.4

(7.43 - 6.21) = 1.22ms
(14.26 - 6.21) = 8.05ms

6x faster in Ember 1.11.3

var template =
    "{{#link-to 'index'}}Home{{/link-to}}" +
    "{{#link-to 'about'}}About{{/link-to}}" +
    "{{#link-to 'contact-us'}}Contact Us{{/link-to}}" +
    "{{#link-to 'index' (query-params a='aaa' b='bbb' c='ccc')}}Home with query params{{/link-to}}" +
    "{{#link-to 'parent.child1'}}Parent Child 1{{/link-to}}" +
    "{{#link-to 'parent.child2'}}Parent Child 2{{/link-to}}" +
    "{{#link-to 'parent.child3'}}Parent Child 3{{/link-to}}" +
    "{{#link-to 'contacts.contact.details' view.contact1}}Contact 1{{/link-to}}" +
    "{{#link-to 'contacts.contact.details' view.contact2}}Contact 2{{/link-to}}" +
    "{{#link-to 'contacts.contact.details' view.contact3}}Contact 3{{/link-to}}";

 var template =
    "<a href=\"{{href-to 'index'}}\">Home</a>" +
    "<a href=\"{{href-to 'about'}}\">About</a>" +
    "<a href=\"{{href-to 'contact-us'}}\">Contact Us</a>" +
    "<a href=\"{{href-to 'index' (query-params a='aaa' b='bbb' c='ccc')}}\">Home with query params</a>" +
    "<a href=\"{{href-to 'parent.child1'}}\">Parent Child 1</a>" +
    "<a href=\"{{href-to 'parent.child2'}}\">Parent Child 2</a>" +
    "<a href=\"{{href-to 'parent.child3'}}\">Parent Child 3</a>" +
    "<a href=\"{{href-to 'contacts.contact.details' view.contact1}}\">Contact 1</a>" +
    "<a href=\"{{href-to 'contacts.contact.details' view.contact2}}\">Contact 2</a>" +
    "<a href=\"{{href-to 'contacts.contact.details' view.contact3}}\">Contact 3</a>";