Some improvements to the error pages

[hyperionel]

Fixes #186, #194, #195, #217, #222

• Improve the errors#index queries #186
• There is an issue with the url provided by the errors #194
• List more errors in the errors/sidebar #195
• Don't show the broadcast box if there is no subscriber #217
• Change the way we send messages through Intercom #222

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This change is

[codecov-io]

Current coverage is 97.03% (diff: 100%)

Merging #203 into master will increase coverage by <.01%

@@             master       #203   diff @@
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  Files           172        172          
  Lines          5553       5559     +6   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
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+ Hits           5388       5394     +6   
  Misses          165        165          
  Partials          0          0          

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[Chocksy]

Reviewed 3 of 4 files at r1.
Review status: 3 of 4 files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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app/views/errors/index.html.haml, line 23 [r1] (raw file):

  #grouped-issuescontainer.col-lg-12.pagecontainer
    - subscribers = @errors.includes(:subscribers).map{ |x| { x.id => x.subscribers.size } }.reduce( { }, :merge)
    = render partial: 'error', collection: @errors, locals: { subscribers: subscribers }

Why are you doing this here? You can just have that subscribers call in the partial. Also, that line of code is really weird.

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Comments from Reviewable

[Chocksy]

Use i18n for this. Look at rails i18n count. You should have this line here: = t('subscribers.count', count: subscribers.size)

[Chocksy]

Reviewed 4 of 7 files at r3.
Review status: 6 of 10 files reviewed at latest revision, 2 unresolved discussions.

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Comments from Reviewable

[Chocksy]

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Reviewed 1 of 2 files at r2, 3 of 7 files at r3, 2 of 2 files at r4.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from Reviewable