Reorganize returned object

[jxnblk]

Consider adding in functions from the app's controller.

[johno]

Proposed reorganized object featuring some missing data from cssstats/cssstats#126:

{
  "averages": {
    "specificity": 123,
    "ruleSize": 123,
    "groupedSelectorSize": 123
  },
  "size": 692,
  "gzipSize": 287,
  "selectors": [],
  "rules": [],
  "declarations": {
    "all": [],
    "byProperty": {},
    "unique": {},
    "byMedia": {
      "(minWidth:30123em)": {
        "raw": "(min-width:30.123em)",
        "declarations": []
    },
  },
  "aggregates": {
    "selectors": 7,
    "declarations": 15,
    "properties": [],
    "mediaQueries": [],
    "property": {},
    "idSelectors": 1,
    "classSelectors": 4,
    "pseudoClassSelectors": 1,
    "pseudoElementSelectors": 1,
    "importantDeclarations": 2,
    "vendorPrefixProperties": 5,
    "universalSelectors": 1,
    "siblingSelectors": 1,
    "childSelectors": 1,
    "attributeSelectors": 1,
    "typeSelectors": 1,
    "0orNoneValues": 1
  },
  "warnings": {
    "expensiveSelectors": [],
    "expensiveProperties": []
  }
}

The only breaking change here is the "byMedia" key, as it will now store an object with the raw value and a "declarations" array.

Is there other stuff we'd like to see here?

[johno]

Closing as this will be handled in #42