Added information about composer in installation help
Merge pull request #47 from whisller/added_composer_in_installation_help

Added information about composer in installation help
Extract business class + Fix CS
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[Entity] Fix map pre persist
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[Tests] Fix code coverage
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Fix #51
Merge pull request #52 from Padam87/master

[DependencyInjection][MapHelper] Fix arguments order
[Doc] Fix installation (Fix #53)
[EventListener] Fix fake request listener registration
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Fix typo
Add UPGRADE file