LRDOCS-1019 Remove unnecessary PubSub tutorial becuase it's more fun/interactive than useful
LRDOCS-1020 Replace interactive steps with general overview of gadget-to-gadget PubSub
LRDOCS-1020 Remove unnecessary code in the gadget-to-gadget tutorial
LRDOCS-1020 Replace interactive steps with general overview of gadget-to-portlet PubSub
LRDOCS-1021 Replace interactive steps with general steps for gadget editor
LRDOCS-1020 Add gadgets and hook available for testing
Merge branch 'opensocial-changes' of https://github.com/codyhoag/liferay-docs into pr-160-opensoc
Merge pull request #894 from jhinkey/pr-160-opensoc

QA'd tutorials - OpenSocial