fix(dateparser): add type and validity check

- Add type and validity check to ensure proper date object is created
- Make code style uniform in scripts

chore(dateparser): revert code style changes

src/dateparser/dateparser.js

@@ -125,7 +125,7 @@ angular.module('ui.bootstrap.dateparser', [])
 
     if ( results && results.length ) {
       var fields, dt;
-      if (baseDate) {
+      if (angular.isDate(baseDate) && !isNaN(baseDate.getTime())) {
         fields = {
           year: baseDate.getFullYear(),
           month: baseDate.getMonth(),

src/dateparser/test/dateparser.spec.js

@@ -162,6 +162,14 @@ describe('date parser', function () {
       expect(dateParser.parse('31-04-2013', 'dd-MM-yyyy')).toBeUndefined();
       expect(dateParser.parse('November 31, 2013', 'MMMM d, yyyy')).toBeUndefined();
     });
+
+    it('should work when base date is a string', function() {
+      expect(dateParser.parse('01-02-2034', 'dd-MM-yyyy', '05-06-2078')).toEqual(new Date(2034, 1, 1));
+    });
+
+    it('should work when base date is an invalid date', function() {
+      expect(dateParser.parse('30-12-2015', 'dd-MM-yyyy', new Date('foo'))).toEqual(new Date(2015, 11, 30));
+    });
   });
 
   it('should not parse non-string inputs', function() {