GetCurrentUser observable for user identity changes, restore RxJs Ajax functionality

[gallayl]

GetCurrentUser() Observable

• [x] Create a public endpoint on IAuthenticationService for getting the current user from token payload
• [x] Create a public RxJs Observable on the Repositoy that will observe user identity changes
• [x] Testing

RxJs functionality

• [x] Move CORS checking from Repository to HttpProvider level
• [x] Remove custom XmlHttpRequest logics from RxAjaxHttpProvider
• [x] Restore RxJs's Ajax call
• [x] Check coverage

[codecov-io]

Codecov Report

Merging #47 into development will increase coverage by 0.58%. The diff coverage is 97.61%.

@@               Coverage Diff               @@
##           development      #47      +/-   ##
===============================================
+ Coverage         96.8%   97.38%   +0.58%     
===============================================
  Files               50       50              
  Lines             1440     1454      +14     
  Branches           205      206       +1     
===============================================
+ Hits              1394     1416      +22     
+ Misses              13        8       -5     
+ Partials            33       30       -3

Impacted Files	Coverage Δ
src/Repository/BaseRepository.ts	100% <100%> (ø)	:arrow_up:
src/Collection.ts	88.23% <100%> (+3.72%)	:arrow_up:
src/Authentication/JwtService.ts	100% <100%> (ø)	:arrow_up:
src/HttpProviders/RxAjaxHttpProvider.ts	92.85% <88.88%> (+21.42%)	:arrow_up:
src/Repository/SnRepository.ts	100% <0%> (ø)	:arrow_up:
src/HttpProviders/index.ts	100% <0%> (ø)	:arrow_up:

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