removing the static, disk-based node cache.
update queries to be more efficient
Merge pull request #628 from bcipolli/remove_node_cache

removing the static, disk-based node cache.
Merge branch 'release-0.10' of github.com:learningequality/ka-lite into efficient_student_view
Merge branch 'release-0.10' of github.com:learningequality/ka-lite into share_basepoints

Conflicts:
	kalite/static/data/nodecache.json
Merge branch 'efficient_student_view' of github.com:bcipolli/ka-lite into share_basepoints
small fixes to get user to their account management page.
Merge branch 'account_management_fixes' into share_basepoints
exposing functions for computing Video and Exercise points.