Group lecturer

[jessicasalmon]

• a group lecturer and group admin are now connected by a code
• if a group_admin stops paying, we log any associated group lecturer accounts out
• if a group_admin has not paid, we prevent any associated group lecturer accounts to sign in

Relates #622

[codecov-io]

Codecov Report

Merging #634 into staging will increase coverage by 0.06%. The diff coverage is 97.61%.

@@             Coverage Diff             @@
##           staging     #634      +/-   ##
===========================================
+ Coverage    94.19%   94.26%   +0.06%     
===========================================
  Files          124      126       +2     
  Lines         2791     2841      +50     
  Branches       481      498      +17     
===========================================
+ Hits          2629     2678      +49     
- Misses         162      163       +1

Impacted Files	Coverage Δ
src/js/reducers/register.js	100% <ø> (ø)	:arrow_up:
src/js/reducers/super-admin.js	100% <ø> (ø)	:arrow_up:
server/plugins/super-admin.js	88.57% <100%> (+2.85%)	:arrow_up:
server/lib/getUserByEmail.js	100% <100%> (ø)	:arrow_up:
server/plugins/users.js	98.27% <100%> (+0.12%)	:arrow_up:
server/plugins/authenticate-user.js	96.07% <100%> (+0.52%)	:arrow_up:
server/lib/authentication/saveUser.js	100% <100%> (ø)	:arrow_up:
src/js/actions/super-admin.js	100% <100%> (ø)	:arrow_up:
server/lib/validateGroupLecturerByCode.js	100% <100%> (ø)
server/lib/super-admin/saveClient.js	100% <100%> (ø)	:arrow_up:
... and 5 more

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[sohilpandya]

@Danwhy strangely the codecov has gone back to normal on this particular branch. Which is based of-of the other branches 😊 Probably worth merging the other branches as this one seems to work ok.