Event Manager Improvements and Documentation

[frne]

@lphuberdeau sorry for being so late with another PR... It contains improved events and some general simplifications including full-blown documentation ;)

Doctrine-Style event namings

I have renamed existing events and added some new ones, to go as near as possible with the Doctrine ORM Events. The following events are available, working and tested:

• prePersist - Fires before an entity is persisted
• postPersist - Fires after an entity is persisted
• preRelationCreate - Fires before a relation is created
• postRelationCreate - Fires after a relation is created
• preStmtExecute - Fires before a statement (query) is executed
• postStmtExecute - Fires after a statement (query) is executed
• preRemove - Fires before an entity is removed
• postRemove - Fires after an entity is removed
• preRelationRemove - Fires before a relation is removed
• postRelationRemove - Fires after a relation is removed

Btw. I moved some tests out of the EntityManagerTest to the newly created EventManagerTest to keep it clean...

Documentation

I started writing a documentation describing the usage of the doctrine events. IMHO, this would blow the readme.md and kill readability. Therefore, i created a doc directory. There is some different documentation. I would find it nice, if we can present the readme.md as "overview at a glace" and keep it short. Therefore, I moved also some existing documentation to the doc directory...

Also added documentation for events and annotations.

This is a follow-up for #58 and #65

[frne]

@PetitPhilou Probably interesting for you ;)

[philippemiguet]

@frne Thanks! I'll play with it next week for sure !

[philippemiguet]

@frne again, thanks, it works perfectly :)

[frne]

@PetitPhilou You're welcome ;)