update Gaia to latest SDK master

[fedekunze]

Updated to SDK commit: e4c8bd72b

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: clog add [section] [stanza] [message]

• Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-io]

Codecov Report

Merging #94 into master will decrease coverage by 0.43%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
- Coverage   67.74%   67.31%   -0.44%     
==========================================
  Files           3        3              
  Lines         462      462              
==========================================
- Hits          313      311       -2     
- Misses        118      120       +2     
  Partials       31       31

[alexanderbez]

ACK