Added a doctrine orm query function for phone number

[modiamir]

Added a function to use in doctrine query builder and DQL for making query based on PhoneNumber object like this:

$util = $this->get('libphonenumber.phone_number_util');
$phone = $util->parse('09125995014', 'IR');
        
$qb = $this->getDoctrine()->getRepository('AppBundle:User')
    ->createQueryBuilder('u');

$user = $qb->where($qb->expr()->eq('u.phone', "PHONE($phone)"))
    ->getQuery()
    ->getResult();

To use this DQL function we need to add this to symfony configuration:

doctrine:
    orm:
        dql:
            string_functions:
                PHONE: Misd\PhoneNumberBundle\Doctrine\ORM\DQL\Functions\Phone

[shakaran]

@modiamir Could you update your PR since the test only fails for HHVM

HHVM is no longer supported on Ubuntu Precise. Please consider using Trusty with dist: trusty.

So @rh389 could check later and merge if all it is ok, thanks!

[modiamir]

@shakaran i added dist: trusty to .travic-ci.yml, now tests pass for all versions of php

[shakaran]

@modiamir Thanks very much! Now the maintainer could easy merge after his review ;)

[modiamir]

@rh389 would you please review this pr?