Feat integrations

[Chocksy]

fixes #24

• create method in drivers to hold the api_url of each. Please use a config in integrations.yml that defines if the integration is in sandbox mode or not:

def api_url
   if config[:sandbox]
     'http..sandbox'
  else
    'http..live'
  end
end

• make the method that calls to get repositories from github and we'll need a method in integrations that will call that method as a general one to make sure we can use this for other instances.
• make a method in intercom that gets the same websites from their api
• write specs for auth_controller and the integrations lib files
• make the intercom not use the select_application functionality it does not need it
• adjust the github select repo code to include the organization repos too
• change the view for adding integrations to a simple table instead of tabs

[codecov-io]

Current coverage is 97.14%

Merging #102 into master will increase coverage by 0.60%

@@             master       #102   diff @@
==========================================
  Files           172        173     +1   
  Lines          4864       5436   +572   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits           4696       5281   +585   
+ Misses          168        155    -13   
  Partials          0          0          

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