Merge pull request #1 from vasyabigi/master

merge master
fix customPaging to not be "undefined" when it is not set in directive params
use "undefined" instead of null (as proposed by @i8ramin), fix "responsive" option - it must be object, not a method
remove coma
Merge pull request #43 from donatasdwix/master

fix customPaging to not show "undefined", fix "responsive" option