Merge pull request #968 from feroc1ty/master

change column postgresql defaul, spacing bug 1.7.0 fix

lib/dialects/postgres/query-generator.js

@@ -177,7 +177,7 @@ module.exports = (function() {
         if (definition.indexOf('DEFAULT') > 0) {
           attrSql += Utils._.template(query)({
             tableName: this.quoteIdentifiers(tableName),
-            query:     this.quoteIdentifier(attributeName) + ' SET DEFAULT' + definition.match(/DEFAULT ([^;]+)/)[1]
+            query:     this.quoteIdentifier(attributeName) + ' SET DEFAULT ' + definition.match(/DEFAULT ([^;]+)/)[1]
           })
 
           definition = definition.replace(/(DEFAULT[^;]+)/, '').trim()