improvements to s3-disable-ssl-verify config option

[kkellerlbl]

Updating based on Gavin's comments.

• [x] Use a global variable for HTTP timeouts (both client and server)
• [x] Check docs for whether setting custom transport for AWS client has any unpleasant side effects
• [x] Move http.Client for S3 to be shared
• [x] Make s3 tests use a new http.Client on each test of NewS3FileStore
• [x] Add tests for self-signed cert flag
• [x] Update version, documentation and release notes
• [ ] Manually test global timeouts (figure out how)

[codecov[bot]]

Codecov Report

Merging #133 (b56d832) into s3-disable-ssl-verify (3d4ff6f) will decrease coverage by 0.06%. The diff coverage is 78.57%.

@@                    Coverage Diff                    @@
##           s3-disable-ssl-verify     #133      +/-   ##
=========================================================
- Coverage                  91.20%   91.13%   -0.07%     
=========================================================
  Files                         14       14              
  Lines                       1421     1422       +1     
=========================================================
  Hits                        1296     1296              
- Misses                        92       93       +1     
  Partials                      33       33              

Impacted Files	Coverage Δ
app/blobstore.go	0.00% <0.00%> (ø)
filestore/s3.go	90.34% <100.00%> (-0.07%)	:arrow_down:
service/build.go	63.46% <100.00%> (+0.71%)	:arrow_up:
service/server.go	97.79% <100.00%> (ø)

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[MrCreosote]

There's something weird going on with the tests. They clearly ran on this PR: https://www.travis-ci.com/github/kbase/blobstore/builds/208241032

But they don't seem to be running any more

[MrCreosote]

But they ran on commit 9b121c8 which isn't in this PR

[MrCreosote]

Looks like tests are running again