load the quiz from the lesson, not the quiz route
load video from the lesson initialization step.

the code is pretty messy right now because an action is triggering another action.  i created a technical debt story in the trello to think about this pattern more.
extract lesson into individual react component
display sidebar elements based on lesson contents
remove debugger statement
rename content to quiz_container.jsx

this will pave the way for different types of pages, like video and audio.
add basic framework for application flux flow
add lesson_item component
add basic page change flow.

a lot of stuff still needs to be fleshed out, so the actual page change won't work.  but, we can at least start filling it in.
set up the flux flow so it tries to open the non-existent video container
first cut at video container.
get rid of unneeded quiz code
first cut at video container.
get rid of unneeded quiz code
remove unneeded file
Merge branch 'master' of github.com:dmitriiabramov/esl
capitalize video/audio/quiz in the sidebar
make hover into the same style
update postgres instructions
add active style for sidebar