Update Dt.php

Fix issue https://github.com/Andre-487/php_rutils/issues/3
Merge pull request #4 from walik91/master

fix issue #3, in Dt::distanceOfTimeInWords exclude hours if it equals 0
add test for issue #3
Update Dt.php

This resolves #5
fix examples web-representation
Update Dt.php
fix UTF-8 NBSP in Dt, issue #5
merge pull request
add encoding module parameter, fix 1 problem from issue #7
correct table
improve encoding for multibyte strings
Merge pull request #10 from githubjeka/patch-3

Correct translation table, fix issue #7
fix tests to match new translation table
Added method:
Dt::getAge($birthDate)

How to use:
echo RUtils::dt()->getAge('14.11.1989');

Tests:
DtTest::testGetAge()
Added test for getAge function. DtTest::testGetAge()
Merge pull request #12 from plutov/master

New method to calculate age
move Dt::getAge function to it own place in class
fix Dt::getAge issue #13, the case when null is passed
mixed type dates processing in Dt module is now makes with Dt::_processDateTime
fix issue #11