Add from and size parameters in the listCollections route

[dbengsch]

fix #440

Response format has changed.
Previously:

{
  collections: {
    realtime: [
      'realtimeCollection',
      '...'
    ],
    stored: {
      'storedCollection',
      '...'
    }
  }
  type: 'all'
}

Now:

{
  collections: [
    {name: 'realtimeCollection', type: 'realtime'},
    {name: 'storedCollection', type: 'stored'},
    {...}
  }
  type: 'all'
  from: 0,
  size: 12
}

Collections are sorted alphanumerically. from and size appear in the response only if they have been used in the request.

[codecov-io]

Current coverage is 97.34% (diff: 100%)

Merging #518 into develop will increase coverage by 0.01%

@@            develop       #518   diff @@
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  Files           116        116          
  Lines          5921       5947    +26   
  Methods         613        615     +2   
  Messages          0          0          
  Branches       1145       1152     +7   
==========================================
+ Hits           5763       5789    +26   
  Misses          158        158          
  Partials          0          0          

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[benoitvidis]

Have we already all agreed node 6 is a strong requirement?

[benoitvidis]

Could be leveraged for the time being using strict mode.

[dbengsch]

@benoitvidis I think we did already.

[dbengsch]

@benoitvidis added a 'use strict'