Description:
------------
NPT is supposed to be the abbreviation for Nepal Time (Asia/Kathmandu) 
http://www.timeanddate.com/time/zones/

but timezone_name_from_abbr("NPT") returns:

string(16) "America/St_Johns"

DateTimeZone::listAbbreviations() shows Asia/Kathmandu with offset 19800.

19800 = 3600 * 5.5 which is UTC+05:30 - that is the time zone for Indian cities like Kokata.

Nepal Kathmandu is UTC+05:45 so the offset should be 3600 * 5.75 = 20700



Test script:
---------------
$x = timezone_name_from_abbr("NPT");
var_dump($x);

$y = DateTimeZone::listAbbreviations();
var_dump($y);


Expected result:
----------------
$x should have "Asia/Kathmandu"

The output in $y should have for Asia/Kathmandu and Asia/Katmandu

    [7]=>
    array(3) {
      ["dst"]=>
      bool(false)
      ["offset"]=>
      int(20700)
      ["timezone_id"]=>
      string(14) "Asia/Kathmandu"
    }
    [8]=>
    array(3) {
      ["dst"]=>
      bool(false)
      ["offset"]=>
      int(20700)
      ["timezone_id"]=>
      string(13) "Asia/Katmandu"
    }


Actual result:
--------------
string(16) "America/St_Johns"

In the $y output:

    [7]=>
    array(3) {
      ["dst"]=>
      bool(false)
      ["offset"]=>
      int(19800)
      ["timezone_id"]=>
      string(14) "Asia/Kathmandu"
    }
    [8]=>
    array(3) {
      ["dst"]=>
      bool(false)
      ["offset"]=>
      int(19800)
      ["timezone_id"]=>
      string(13) "Asia/Katmandu"
    }