docs - how to use data; what data is tracked

update after feedback (+1 squashed commit)
Squashed commits:
[00d7a7f] docs - how to use data; what data is tracked
Merge pull request #29 from yeoman/docs_update

docs - how to use data; what data is tracked
bump dep, reworked yandex cookie, enabled GA real-time tracking

fix pr per comments, working cookie w/ more content (+1 squashed commit)
Squashed commits:
[8114703] bump dep, reworked yandex cookie, enabled GA real-time tracking