Add reference to LocustRunner instance and WebUI instance on Environment

[heyman]

No description provided.

[codecov]

Codecov Report

Merging #1291 into master will decrease coverage by 0.04%.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##           master    #1291      +/-   ##
==========================================
- Coverage    79.6%   79.55%   -0.05%     
==========================================
  Files          23       23              
  Lines        2069     2074       +5     
  Branches      320      321       +1     
==========================================
+ Hits         1647     1650       +3     
- Misses        342      343       +1     
- Partials       80       81       +1

Impacted Files	Coverage Δ
locust/main.py	23.59% <0%> (ø)	⬆️
locust/runners.py	75.76% <100%> (-0.66%)	⬇️
locust/env.py	100% <100%> (ø)	⬆️
locust/web.py	89.33% <88.46%> (+0.14%)	⬆️
locust/core.py	91.73% <0%> (+0.41%)	⬆️

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[cyberw]

LGTM. And I need it, so I'm merging :)