Started to work on Propel2 commands integration (only a few work at the moment)
Removed useless buildtime-conf file generation
Reorganised a bit the commands
Implemented the ModelBuild command
Revert "Removed useless buildtime-conf file generation"

This reverts commit bca3140e98c45e1624b6e40bdff8886d02758ff0.

Conflicts:
	Command/AbstractCommand.php
Implemented the SqlBuild command
Moved the schema-locating code outside the AbstractCommand
Cleaned a bit the AbstractCommand
Handle master/slave connections
Fixed classname configuration
Fixed the DataCollector
Implemented the GraphvizGenerate command
Checkstyle fixes
Implemented the DatabaseReverse command
Consider the connection option while aggregating the schemas
Add: support for param converters
Started to add tests (almost green!)
Do not ignore build properties and behaviors given in the configuration anymore
Restored the Build hub command
Removed useless todo annotation