More varied text generators, parallellized phrasefinder calls and better environment variable checks

[codecov[bot]]

Codecov Report

Merging #53 into master will increase coverage by 1.28%. The diff coverage is 90.21%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   88.87%   90.15%   +1.28%     
==========================================
  Files          32       32              
  Lines        2040     2072      +32     
==========================================
+ Hits         1813     1868      +55     
+ Misses        227      204      -23

Impacted Files	Coverage Δ
talkgenerator/schema/schemas.py	99.14% <100%> (+0.02%)	:arrow_up:
talkgenerator/util/os_util.py	89.28% <100%> (+1.53%)	:arrow_up:
talkgenerator/runtime_checker.py	100% <100%> (ø)
talkgenerator/utils.py	61.25% <100%> (-0.95%)	:arrow_down:
talkgenerator/util/language_util.py	91.11% <100%> (+5.61%)	:arrow_up:
talkgenerator/util/generator_util.py	83.78% <100%> (+0.8%)	:arrow_up:
talkgenerator/schema/slide_topic_generators.py	86.9% <100%> (-4.13%)	:arrow_down:
talkgenerator/sources/text_generator.py	92% <100%> (+0.24%)	:arrow_up:
talkgenerator/sources/wikihow.py	81.72% <66.66%> (-0.51%)	:arrow_down:
talkgenerator/sources/reddit.py	84.84% <71.42%> (+0.97%)	:arrow_up:
... and 9 more

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[twinters]

I think I addressed all comments in the latest couple of commits! :)