Add UConverter class (ICU's UConverter API)

RFC at http://wiki.php.net/rfc/uconverter
intl: doc explaining error conventions
Fix arginfo of BreakIterator::getLocale
Improve ERROR.CONVENTIONS
Write local err on intlcal_get_time_zone() failure
Fix zpp() call in intl/converter
intl/converter in line w/ intl error handling
Merge branch 'PHP-5.5'

* PHP-5.5:
  intl/converter in line w/ intl error handling
  Fix zpp() call in intl/converter
  Write local err on intlcal_get_time_zone() failure
  Improve ERROR.CONVENTIONS
  Fix arginfo of BreakIterator::getLocale
  intl: doc explaining error conventions
  Add UConverter class (ICU's UConverter API)
Make converter work on VS
Fixed paramter count
Merge branch 'PHP-5.5'

* PHP-5.5:
  Fixed paramter count
  Make converter work on VS