Replace usage of find & findIndex with other methods to support IE & PhantomJS

[MasterCassim]

After debugging quite a while I have noticed that the mocking does not work with IE & PhantomJS unless there is a polyfill for find and findIndex. I have replaced the occurrences with other methods supported in all browsers.

[bendykowski]

Hi @MasterCassim, why have you reverted changes in Mock.ts? We need to discuss that with @NagRock, I think a nicer solution would be to introduce required polyfills.

[MasterCassim]

I reverted these changes because they were on classes which support the find; I have incorrectly modified the calls.

[codecov-io]

Codecov Report

Merging #88 into master will decrease coverage by 0.12%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   94.58%   94.45%   -0.13%     
==========================================
  Files          35       35              
  Lines         609      613       +4     
  Branches       69       70       +1     
==========================================
+ Hits          576      579       +3     
- Misses         24       25       +1     
  Partials        9        9

Impacted Files	Coverage Δ
src/MethodStubCollection.ts	96.55% <85.71%> (-3.45%)	:arrow_down:

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[MasterCassim]

Any progress?