DRY-ied POPOConverterTest by introducing TestBlogBuilder
PHPDocParser - for parsing properties' phpdoc for their type
POPOObjectFiller + tests for complex objects structure
POPOConverter - better tests to cover property with object type (not array)
PHPDocParser - added null as basic type
Implemented POPOObjectFiller. Updated POPOConverterTest where needed.
Updated parsing phpdoc with 'array|int[]', and other simple types
Optimized ReflectionClass creation for arrays
Added /coverage-phpunit/ to ignored folders
Added version to composer file