iOS Native Tests with pods

[AliAbdelfattah]

What's done?

• Add OCMock dependency to iOS Sample App.
• Add unit test for showSurveyWithToken.
• Remove unnecessary targets from the iOS Sample App.
• Add ios_test job to CircleCI.
• Add InstabugSample.xcworkspace path to .gitignore file.

[codecov]

Codecov Report

Merging #325 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   86.76%   86.76%           
=======================================
  Files          21       21           
  Lines         393      393           
  Branches       75       75           
=======================================
  Hits          341      341           
  Misses         49       49           
  Partials        3        3

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