Added Support Backblaze

[dvriesman]

Included support to send and receive files to/from Backblaze

[araddon]

I created backblaze account for testing, and added env vars to travis and running now https://travis-ci.org/lytics/cloudstorage

[codecov-io]

Codecov Report

Merging #62 into master will decrease coverage by 44.41%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #62       +/-   ##
===========================================
- Coverage   64.89%   20.48%   -44.42%     
===========================================
  Files          13       13               
  Lines        1997     1997               
===========================================
- Hits         1296      409      -887     
- Misses        491     1522     +1031     
+ Partials      210       66      -144

Impacted Files	Coverage Δ
awss3/store.go	0.29% <0%> (-72.92%)	:arrow_down:
azure/store.go	0.3% <0%> (-69.21%)	:arrow_down:
google/store.go	0.66% <0%> (-61.88%)	:arrow_down:
sftp/store.go	13.62% <0%> (-48.04%)	:arrow_down:
google/client.go	0% <0%> (-31.43%)	:arrow_down:

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[dvriesman]

Araddon, your test target does not match the actual code quality :) Could you review it to approve my request? Thank you.

[araddon]

Not entirely sure what is going on with this pr re the import paths? They can't be merged in while pointing to your personal fork. Is your local-directory structure mirroring this github path? ie

/home/dvriesman/go/src/github.com/lytics/cloudstorage

With the cloudstorage .git/config having an upstream pointing to github.com/lytics/cloudstorage and non-upstream pointing at your personal-repo fork?