Added optional use of igbinary if installed
Update ServiceProvider.php
Added missing import
Update ProjectDescriptorMapper.php
Update ProjectDescriptorMapper.php

@mvriel This sounds strange to me because it is working on my project i had tests with. But if the project descriptor is not populated with data my first version just overwritten the cache with empty values then? so maybe it will be better to clear the cache if the value couldnot be unserialized. what do you think?
Update ProjectDescriptorMapper.php
add test for FileDescriptor.php
Added unit test for Statistics::transform
Also tested the Statistics::transform method with a different starting artefact.
Updated for PSR-2
finalizing FileDescriptorTest while finishing testGetAllErrors()
Refactored the StatisticsTest for better reuse.
Added new docs on QA
added Translator\Configuration test
added Translator\ServiceProviderTest
Fix more DocBlocks
Merge pull request #1370 from slaubi/FileDescriptorTest

File descriptor test
Merge pull request #1362 from pascaldevink/statistics-unit-tests

[TestFest] Added unit tests for Writer\Statistics
improve test code. Moved locale to class variable, Optimized mock creation
Merge pull request #1309 from siad007/patch-20

Added optional use of igbinary if installed