docs(Observable): add documentation for interval

[cschomer]

Add docs for operator : creation - interval

Close #80

[niklas-wortmann]

Could you change your commit messages. There are several :, these make travis break. If you need any help, just inform me. Thanks for your work!!!

[cschomer]

Yes sorry about that, should be corrected and passing now.

[codecov-io]

Codecov Report

Merging #296 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #296   +/-   ##
=======================================
  Coverage   90.49%   90.49%           
=======================================
  Files         115      115           
  Lines         442      442           
  Branches       10       10           
=======================================
  Hits          400      400           
  Misses         40       40           
  Partials        2        2

Impacted Files	Coverage Δ
src/operator-docs/creation/interval.ts	100% <ø> (ø)	:arrow_up:

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[ladyleet]

@cschomer have time to make these changes yet? we'd love to merge!

[cschomer]

@ladyleet Hi I checked in 2 commits for the requested changes, are those not showing up? I think with those two that should address the two requested changes.

commit ea9c472d97e6c7b0f00feabc55bed642ab0781d1

[ashwin-sureshkumar]

@cschomer - Thanks for the PR.

Please use Close #<issue-number> in your future commits in the description. This will auto-close the issue once the PR is merged in.

For this one, we can manually close the issue.