Added step classes to step and backdrop divs

[j0shko]

Closes #40

[tnicola]

Hi @j0shko ,
The PR is fine, thanks for contributing! Could you please add a couple of unit tests to check the class is added correctly in both the component and the backdrop? Also, the build is not passing since a unit test is failing.

If you want I can do all the modifications.

[j0shko]

Hi @tnicola ,
Thank you for the quick response. 😄
I'll add tests and fix the build, it's not a problem.

[codecov-io]

Codecov Report

Merging #41 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   92.77%   92.78%   +<.01%     
==========================================
  Files          16       16              
  Lines         831      832       +1     
  Branches      105      105              
==========================================
+ Hits          771      772       +1     
  Misses         27       27              
  Partials       33       33

Impacted Files	Coverage Δ
src/lib/src/services/joyride-backdrop.service.ts	96.96% <100%> (+0.02%)	⬆️

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[j0shko]

Hi @tnicola,
I switched from classes to ids, and added tests. Can you please check if tests are in correct place?

[tnicola]

Everything's fine, merged!Thanks @j0shko !

[tnicola]

Released in the new version 2.2.8.