Add support for AWS_PROFILE

[Julian]

This changeset stacks after #52 and #53.

[codecov[bot]]

Codecov Report

Merging #54 into master will decrease coverage by 0.42%. The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
- Coverage   96.35%   95.93%   -0.43%     
==========================================
  Files          74       74              
  Lines        8892     8924      +32     
  Branches      626      628       +2     
==========================================
- Hits         8568     8561       -7     
- Misses        202      231      +29     
- Partials      122      132      +10

Impacted Files	Coverage Δ
txaws/tests/test_credentials.py	100% <100%> (ø)	:arrow_up:
txaws/testing/base.py	94.87% <100%> (+0.13%)	:arrow_up:
txaws/credentials.py	92.85% <92.85%> (-1.27%)	:arrow_down:
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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[Julian]

Closes #15.

[Julian]

Thanks! -- Made the wording change there.