Merge pull request #1 from nkukard/better-non-blocking

Better non blocking
don't use PEAR::isError, use instanceof instead.
Revert "don't use PEAR::isError, use instanceof instead."

This reverts commit e15db31f72b1e3d1ff8532659190fbd8af70bbee.
Net EPP using Exceptions instead of Pear Error

Signed-off-by: Charl Mert <cmert@lbsd.net>
Acked-by: Nigel Kukard <nkukard@lbsd.net>