Add support to secured endpoints throught Authorization header

[sebasjm]

This is a change I made to allow communication with a server that require authorization.

[andrewimm]

Thanks for the PR.

I have to requests: first, credentials isn't clear what it refers to. I'd want to use something along the lines of "bearer token" or "server auth token."

It will probably be decided by the second question I have: what is the best way to include http basicauth as well? We want to be able to specify both an auth type and an auth token.

Taking all of that into account, I'd ask that this be extended into two fields: serverAuthType and serverAuthToken (in CoreManager, SERVER_AUTH_TYPE and SERVER_AUTH_TOKEN).

Then, change the logic in the REST controller to

if (CoreManager.get('SERVER_AUTH_TYPE') && CoreManager.get('SERVER_AUTH_TOKEN') {
  headers['Authorization'] = CoreManager.get('SERVER_AUTH_TYPE') + ' ' + CoreManager.get('SERVER_AUTH_TOKEN');
}

[codecov]

Codecov Report

Merging #358 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
- Coverage   84.35%   84.32%   -0.04%     
==========================================
  Files          46       46              
  Lines        3663     3668       +5     
  Branches      835      836       +1     
==========================================
+ Hits         3090     3093       +3     
- Misses        573      575       +2

Impacted Files	Coverage Δ
src/CoreManager.js	100% <ø> (ø)	⬆️
src/RESTController.js	83.06% <ø> (+0.27%)	⬆️
src/Parse.js	79.41% <ø> (-2.13%)	⬇️

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[codecov]

Codecov Report

Merging #358 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
+ Coverage   88.83%   88.85%   +0.01%     
==========================================
  Files          53       53              
  Lines        4620     4628       +8     
  Branches     1069     1070       +1     
==========================================
+ Hits         4104     4112       +8     
  Misses        516      516

Impacted Files	Coverage Δ
src/CoreManager.js	100% <ø> (ø)	⬆️
src/Parse.js	85.71% <100%> (+1.09%)	⬆️
src/RESTController.js	80.98% <100%> (+0.27%)	⬆️

---

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