Refactor go code and fix link to go report card

[maciaszczykm]

Continuation of #500. Didn't resolve issues like:

Line 136: warning: can probably use "var result []Event" instead (golint)

Because simple change of declaration break tests.

Moreover, issues like:

Line 76: warning: struct field CpuRequirement should be CPURequirement (golint)

Weren't fixed, because it's probably too much changes.

[codecov-io]

Current coverage is 83.59%

Merging #504 into master will not affect coverage as of ea14406

@@            master    #504   diff @@
======================================
  Files           84      84       
  Stmts          695     695       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit            581     581       
  Partial          0       0       
  Missed         114     114       

Review entire Coverage Diff as of ea14406

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[floreks]

Reviewed 11 of 11 files at r1.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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src/app/backend/deploy.go, line 32 [r1] (raw file):
for the/a description?

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src/app/backend/heapsterclient.go, line 32 [r1] (raw file):
InClusterHeapsterClient is an in-cluster

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Comments from the review on Reviewable.io

[floreks]

Small comments. Rest

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Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from the review on Reviewable.io

[maciaszczykm]

PTAL

[floreks]

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Reviewed 2 of 2 files at r2.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from the review on Reviewable.io

[maciaszczykm]

Review status: all files reviewed at latest revision, 2 unresolved discussions.

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src/app/backend/deploy.go, line 32 [r1] (raw file):
Done.

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src/app/backend/heapsterclient.go, line 32 [r1] (raw file):
Done.

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Comments from the review on Reviewable.io