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>
Fixed timeouts and added noblocking write

* Fixed timeouts for non-blocking read
* Added non-blocking write (fixes short write errors)

- Special thanks to Srinivasu for reporting this
dding functionality for deleting, updating, polling
Merge pull request #3 from nkukard/master

Update Net_EPP to use exceptions & remove dependency on PEAR