Fix signing encoding handling.

[mithrandi]

Fixes #20.

Note that while this fixes some cases that were broken in 0.2.3 as well as 0.3.0 (eg. b'object with spaces'), some of the cases were working in 0.2.3 and are now broken in 0.3.0 (eg. b'object:with:colons'), so this is a regression fix.

[codecov[bot]]

Codecov Report

Merging #61 into master will decrease coverage by 0.4%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   96.36%   95.95%   -0.41%     
==========================================
  Files          74       74              
  Lines        8891     8906      +15     
  Branches      627      629       +2     
==========================================
- Hits         8568     8546      -22     
- Misses        201      230      +29     
- Partials      122      130       +8

Impacted Files	Coverage Δ
txaws/testing/s3.py	88.88% <100%> (+1.38%)	:arrow_up:
txaws/client/base.py	88.25% <100%> (-1.95%)	:arrow_down:
txaws/_auth_v4.py	100% <100%> (ø)	:arrow_up:
txaws/testing/s3_tests.py	100% <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/s3/client.py	94.08% <0%> (-0.81%)	:arrow_down:
... and 2 more

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[mithrandi]

This branch is in the wrong repo so the integration tests were skipped on Travis; however they did pass for me locally.

[exarkun]

See #69 for test results / coverage report including the integration test suite. Results there look good.

[mithrandi]

@exarkun: Okay, addressed; think we're good to merge here (sorry it took so long to get back to this).

[exarkun]

Great! Thanks. Did another thing with #71 to see integration test suite results and they look good. So, approved & merging.