fade into the running screen before getting a response from the server

[camilojimenez]

Attempts to solve #1463, by fading into the dashboard screen.

[codecov]

Codecov Report

Merging #1479 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1479      +/-   ##
==========================================
+ Coverage   81.32%   81.43%   +0.11%     
==========================================
  Files          27       27              
  Lines        2377     2386       +9     
  Branches      365      366       +1     
==========================================
+ Hits         1933     1943      +10     
+ Misses        354      351       -3     
- Partials       90       92       +2     

Impacted Files	Coverage Δ
locust/event.py	91.89% <0.00%> (+0.22%)	⬆️
locust/stats.py	89.01% <0.00%> (+0.22%)	⬆️
locust/runners.py	80.61% <0.00%> (+0.32%)	⬆️

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[cyberw]

LGTM! Thanks!