Refactor get data

[SimonLab]

ref: #127

This PR abstract how dwylbot get the data from Github. It also refactor how mocks are loaded for the tests

[codecov[bot]]

Codecov Report

Merging #133 into master will increase coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   98.25%   98.32%   +0.06%     
==========================================
  Files          23       23              
  Lines         172      179       +7     
==========================================
+ Hits          169      176       +7     
  Misses          3        3

Impacted Files	Coverage Δ
web/controllers/rules/pr/merge_conflict.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/pr/no_assignee.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/issue/time_estimation.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/issue/inprogress.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/issue/no_description.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/status/travis_failure.ex	100% <100%> (ø)	:arrow_up:
web/controllers/github_api/in_memory.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/pr/no_description.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/pr/awaiting_review.ex	100% <100%> (ø)	:arrow_up:
web/controllers/rules/issue/noassignees.ex	100% <100%> (ø)	:arrow_up:

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[dwylbot[bot]]

@SimonLab, a reviewer has been added to the pull request. The pull request looks ready for review (no "in-progress" label). So the reviewer has been added as an assignee and the "awaiting-reivew" label as been added to.

Any questions, complaints, feedback, contributions? If you prefer, you can also send us anonymous feedback: https://dwyl-feedback.herokuapp.com/feedback/new

[dwylbot[bot]]

@SimonLab, a reviewer has been added to the pull request. The pull request looks ready for review (no "in-progress" label). So the reviewer has been added as an assignee and the "awaiting-reivew" label as been added to.

Any questions, complaints, feedback, contributions? If you prefer, you can also send us anonymous feedback: https://dwyl-feedback.herokuapp.com/feedback/new