first commit for feature. wrote code, didn't run it yet.
Merge branch 'develop' into feature/LERGO-301_add_like_to_lesson

Conflicts:
	app/index.html
	app/scripts/controllers/lessons/Intro.js
Merge branch 'develop' into feature/LERGO-301_add_like_to_lesson

Conflicts:
	app/index.html
	app/scripts/controllers/lessons/Intro.js
finished implementation for like. - now need to add
 - show like
 - unlike
 - show likes count
LERGO-281, LERGO-301 - finished implementing like mechanism for lesson.
Merge pull request #129 from lergo/feature/LERGO-301_add_like_to_lesson

Feature/lergo 301 add like to lesson