Stop participation in the challenge

[sanketbansal]

Added feature to stop participation in the challenge by the host.

Changes proposed in this pull request:

• Added feature to stop participation in the challenge by the challenge host.

• Link to live demo: http://pr-189-evalai.surge.sh

[codecov-io]

Codecov Report

Merging #189 into master will increase coverage by 0.39%. The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage    51.7%   52.09%   +0.39%     
==========================================
  Files          66       63       -3     
  Lines        3640     3411     -229     
  Branches      412      385      -27     
==========================================
- Hits         1882     1777     -105     
+ Misses       1663     1540     -123     
+ Partials       95       94       -1

Impacted Files	Coverage Δ
...rc/app/components/challenge/challenge.component.ts	93.06% <14.28%> (-5.87%)	:arrow_down:
src/app/services/auth.service.ts	24.05% <0%> (-17.08%)	:arrow_down:
...ponents/publiclists/teamlist/teamlist.component.ts	32.25% <0%> (-5.58%)	:arrow_down:
src/app/components/auth/auth.component.ts	90.9% <0%> (-2.43%)	:arrow_down:
src/app/services/challenge.service.ts	44.72% <0%> (-1.44%)	:arrow_down:
...ubliclists/teamlist/teamcard/teamcard.component.ts	62.5% <0%> (-0.84%)	:arrow_down:
...lengelist/challengecard/challengecard.component.ts	75% <0%> (ø)	:arrow_up:
...ts/auth/reset-password/reset-password.component.ts
...e/challengesettings/challengesettings.component.ts
...ssword-confirm/reset-password-confirm.component.ts
... and 7 more

Impacted Files	Coverage Δ
...rc/app/components/challenge/challenge.component.ts	93.06% <14.28%> (-5.87%)	:arrow_down:
src/app/services/auth.service.ts	24.05% <0%> (-17.08%)	:arrow_down:
...ponents/publiclists/teamlist/teamlist.component.ts	32.25% <0%> (-5.58%)	:arrow_down:
src/app/components/auth/auth.component.ts	90.9% <0%> (-2.43%)	:arrow_down:
src/app/services/challenge.service.ts	44.72% <0%> (-1.44%)	:arrow_down:
...ubliclists/teamlist/teamcard/teamcard.component.ts	62.5% <0%> (-0.84%)	:arrow_down:
...lengelist/challengecard/challengecard.component.ts	75% <0%> (ø)	:arrow_up:
...ts/auth/reset-password/reset-password.component.ts
...e/challengesettings/challengesettings.component.ts
...ssword-confirm/reset-password-confirm.component.ts
... and 7 more

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[Sanji515]

Thanks @sanketbansal for the PR, Closing this as it is opened here after resolving conflicts and with some modifications.