[WIP] Individual lecturer

[jessicasalmon]

• [x] Completed the individual login auth and session flow.
  • user now get warning or is logged out if they have not paid.

PLEASE VIEW AND MERGE AFTER #632

[codecov-io]

Codecov Report

Merging #633 into staging will decrease coverage by <.01%. The diff coverage is 93.1%.

@@             Coverage Diff             @@
##           staging     #633      +/-   ##
===========================================
- Coverage    94.19%   94.18%   -0.01%     
===========================================
  Files          124      124              
  Lines         2791     2804      +13     
  Branches       481      487       +6     
===========================================
+ Hits          2629     2641      +12     
- Misses         162      163       +1

Impacted Files	Coverage Δ
server/lib/getUserByEmail.js	100% <100%> (ø)	:arrow_up:
server/plugins/super-admin.js	87.09% <100%> (+1.38%)	:arrow_up:
server/lib/authentication/saveUser.js	100% <100%> (ø)	:arrow_up:
server/plugins/authenticate-user.js	95.91% <100%> (+0.36%)	:arrow_up:
server/plugins/strategy.js	88.88% <81.81%> (-4.87%)	:arrow_down:

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[Danwhy]

Apart from covering that one line, looks good. Merging this one for now too (see https://github.com/cul-2016/quiz/pull/632#issuecomment-374035084)