Fix phpunit.xml for symfony 3.0 dir structure

The main <directory>../src</directory> in the phpunit.xml was not changed to reflect the new location of the xml script, as the str_replace call checks for "<directory>../src/" (notice the slash at the end)
bug #160 Fix phpunit.xml for symfony 3.0 dir structure (danez)

This PR was merged into the 3.0.x-dev branch.

Discussion
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Fix phpunit.xml for symfony 3.0 dir structure

The main ```<directory>../src</directory>``` in the phpunit.xml was not changed by the directory upgrade to 3.0, as the str_replace call checks for ```"<directory>../src/"``` (notice the slash at the end)

Commits
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1485c66 Fix phpunit.xml for symfony 3.0 dir structure