dataQuality should be encoded as a boolean in JSON, not a string

Author: James McKinney

Diff for: examples/catalog-sample-extended.json

@@ -50,7 +50,7 @@
         "frequency": "one-time",
         "language": "English", 
         "granularity": "",
-        "dataQuality": "true",
+        "dataQuality": true,
         "theme": "education", 
         "references": "http://nces.ed.gov/ccd/data/txt/psu091alay.txt", 
         "landingPage": "http://ed.gov/developer",

Diff for: schema.md

@@ -278,9 +278,9 @@ Field       | title
 ----- | -----
 **Cardinality** | (0,1)
 **Required** | No
-**Accepted Values** | Must be one of the following: true, false
+**Accepted Values** | Must be a boolean value of `true` or `false`
 **Usage Notes** | Indicates whether a dataset
-**Example** |  `{"dataQuality":"true"}`
+**Example** |  `{"dataQuality":true}`
 
 {.table .table-striped}
 **Field** | **category**