Export specific fields

[sanketbansal]

Changes proposed in this pull request:

• Added feature to export specific fields of all submissions.

• Link to live demo: http://pr-192-evalai.surge.sh

[codecov-io]

Codecov Report

Merging #192 into master will decrease coverage by 0.11%. The diff coverage is 43.47%.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage    51.7%   51.58%   -0.12%     
==========================================
  Files          66       67       +1     
  Lines        3640     3681      +41     
  Branches      412      415       +3     
==========================================
+ Hits         1882     1899      +17     
- Misses       1663     1687      +24     
  Partials       95       95

Impacted Files	Coverage Δ
src/app/services/api.service.ts	62.68% <0%> (-5.57%)	:arrow_down:
...bmissions/challengeviewallsubmissions.component.ts	30.63% <36.84%> (-0.11%)	:arrow_down:
...lect-field-dialog/select-field-dialog.component.ts	65% <65%> (ø)

Impacted Files	Coverage Δ
src/app/services/api.service.ts	62.68% <0%> (-5.57%)	:arrow_down:
...bmissions/challengeviewallsubmissions.component.ts	30.63% <36.84%> (-0.11%)	:arrow_down:
...lect-field-dialog/select-field-dialog.component.ts	65% <65%> (ø)

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