Added id parameter in tab directive

[akarabach]

For #1908

[codecov]

Codecov Report

Merging #1909 into development will increase coverage by 0.61%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #1909      +/-   ##
===============================================
+ Coverage        85.93%   86.55%   +0.61%     
===============================================
  Files               78       85       +7     
  Lines             2098     2253     +155     
  Branches           273      290      +17     
===============================================
+ Hits              1803     1950     +147     
- Misses             202      203       +1     
- Partials            93      100       +7

Impacted Files	Coverage Δ
src/tabs/tab.directive.ts	100% <100%> (ø)	⬆️
src/popover/popover.directive.ts	97.61% <0%> (-2.39%)	⬇️
demo/src/app/app.component.ts
scripts/helpers.js
src/dropdown/index.ts	100% <0%> (ø)
src/dropdown/bs-dropdown-container.component.ts	53.84% <0%> (ø)
src/dropdown/bs-dropdown-menu.directive.ts	100% <0%> (ø)
src/dropdown/bs-dropdown.config.ts	80% <0%> (ø)
scripts/helpers.ts	100% <0%> (ø)
src/dropdown/bs-dropdown.directive.ts	84.21% <0%> (ø)
... and 4 more

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[valorkin]

Why do we need I'd param if it is not used?

[akarabach]

@valorkin We integrated tabs with router and we control tabs from <my-wrapper> (see #1908), but we have tabs with the same heading and we don't know how recognize tabs for to activate the desired tab.

[valorkin]

Got your point, I will be back from vacation next week and will be merging PRs