Merge branch '5.5' into PHP-5.5

* 5.5:
  Fixed SNMP_ERR_TOOBIG handling for bulk walk operations. (Boris Lytochkin)
Added NEWS and UPGRADING info for phpdbg
Align 'configure --help' columns
Merge branch 'PHP-5.6'

* PHP-5.6:
  Align 'configure --help' columns
  Added NEWS and UPGRADING info for phpdbg
Merge branch 'PHP-5.4' into PHP-5.5
Merge branch 'PHP-5.5' into PHP-5.6
Merge branch 'PHP-5.6'
Merge remote-tracking branch 'origin/master' into str_size_and_int64