Update moment.d.ts

Added isBefore/isAfter methods without parameters. 
According to the documentation it will default to the current time.
see: http://momentjs.com/docs/#/query/is-before/
Update iscroll-lite.d.ts

Fixed typo in iscroll-lite.d.ts
Update iscroll.d.ts

Fixed typo in iscroll.d.ts
Merge pull request #903 from DickvdBrink/master

Update moment.d.ts