Simpler graphs

[MauriceHendrix]

• Simplified the way graphs for stories are set up (no longer using the comparisson code).
• still loading data in seperate files
• it should be much quicker to switch visualiser as the data does now not get re-downloaded when do

[codecov[bot]]

Codecov Report

Merging #427 (45fcd40) into master (4851fab) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #427   +/-   ##
=======================================
  Coverage   95.67%   95.67%           
=======================================
  Files          76       76           
  Lines        4415     4417    +2     
  Branches      470      470           
=======================================
+ Hits         4224     4226    +2     
  Misses        141      141           
  Partials       50       50           

Impacted Files	Coverage Δ
weblab/datasets/views.py	94.03% <100.00%> (+0.02%)	:arrow_up:
weblab/experiments/urls.py	100.00% <100.00%> (ø)

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