For #2034 - "Knowledge map can't be scrolled" - this is the initial fix to allow user to scroll horizontally if the contents of the map is more than its container's width.
Remove codes to set the `overflow` CSS attribute of the map container and set it's value to `auto`.
Merge pull request #2101 from cpauya/hotfix/2034-Knowledge-map-cant-be-scrolled

Hotfix/2034 knowledge map cant be scrolled
Merge branch 'nalanda-rct2' into nalanda
Merge branch 'nalanda' into playlists
move playlist loading and playlist entry data cleaning into its their
respective models instead of the API resource class
move plain object Playlist and PlaylistEntry into playlist/models.py
fix the fetching of playlist entry IDs
add management command for checking the validity of playlist entries
add missing fields to make the admin created by CreateAdminMixin to be a superuser
add tests for checking data returned by the playlist endpoints
fix errors seen by tests
appease the linting errors of grunt jshint
move dotdotdot.min.js to static-libraries so it won't be caught by the
jshint linter
delete ExerciseLog test since we now use the API
increase the limit of some of the query tests since we now query the
playlists assigned to groups
remove more unnecessary semicolons in exercises.js
print traceback when we can't instantiate a test browser
make format call compatible with python2.6
Merge pull request #2141 from aronasorman/playlists

Fix failing tests due to playlists mega-PR