refs piwik/piwik#8112

Same problem happened with setCookieDomain. They have to be executed before setSiteId so added them to applyFirst

Fix configHeartBeatDelay rename, shouldn't have renamed that variable to ...InSeconds since its in milliseconds.

Add <DEBUG> comments to beforea nd after disableHeartBeatTimer so it doesn't appear in minified piwik.js. And set last tracker request time in makeSureThereIsAGapAfterFirstTrackingRequestToPreventMultipleVisitorCreation for increased code clarity + so it will be set when bulk requests sent.

Clear up heart beat code in piwik.js a bit and make sure heart beat delay cannot be lower than 1 second.

Clean up some additions in this branch, rename setHeartBeatTimer to enableHeartBeatTimer, rename clearHeartBeat to disableHeartBeatTimer, make sure the timer will be set up after any tracker request, not just page view.

Do not ignore ping requests when checking the last tracker request time, since we should ping N seconds after last ping also. And if tracking request is sent before heart beat timer is configured, setup heart beat when configuring heart beat timer.

Add new JS tracking heartbeat feature which replaces old one. New one is more performant and executes much less code on user websites.

New piwik.js tests included as well as an additional utility to make writing future tests easier (use jquery to parse tracker requests that are returned from fetchTrackedRequests). However tests don't currently pass since qunit is not super helpful for testing async code.

refs #7494 make sure to apply disableCookies before any other method that could potentially set a cookie

 Previously was using unescape which did not work well with utf8 non ascii characters.

added ibooks as download