Global os.environ usage begone.

[Julian]

No more use of global os.environ in credentials.

[codecov[bot]]

Codecov Report

Merging #56 into master will decrease coverage by 0.43%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
- Coverage   96.35%   95.92%   -0.44%     
==========================================
  Files          74       74              
  Lines        8924     8910      -14     
  Branches      628      628              
==========================================
- Hits         8599     8547      -52     
- Misses        202      231      +29     
- Partials      123      132       +9

Impacted Files	Coverage Δ
txaws/tests/test_credentials.py	100% <100%> (ø)	:arrow_up:
txaws/credentials.py	92.85% <100%> (ø)	:arrow_up:
txaws/route53/client.py	87.5% <0%> (-12.5%)	:arrow_down:
txaws/testing/integration.py	78.57% <0%> (-7.15%)	:arrow_down:
txaws/service.py	87.61% <0%> (-6.67%)	:arrow_down:
txaws/client/ssl.py	71.25% <0%> (-3.75%)	:arrow_down:
txaws/client/base.py	88.17% <0%> (-2.03%)	:arrow_down:
txaws/s3/client.py	94.08% <0%> (-0.81%)	:arrow_down:
txaws/testing/route53_tests.py	99.34% <0%> (-0.66%)	:arrow_down:

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[exarkun]

It looks like this stacks on #53, at least. Maybe also #54?

[Julian]

Yeah they're all in order, it stacks on both of those

[exarkun]

Great. Thank you. Merging.