support for custom connection object
basic test for connection class
clean up, some types
Renamed Connection->pdoConnection to ->pdo (also accessors).
Made DB::$connections hold Connection objects instead of PDO.
Added example for custom queries.
TravisCI: Disallow failures in PHP 5.5 since final is out
Improved doc blocks
Default to FETCH_ASSOC in Connection query methods
Added Model->merge(), functionallity extracted from Model::fromArray()
Merge commit 'd6fd512c02fd3f694a7e7313dff82372fa4a031a' into develop

Conflicts:
	src/Phormium/Connection.php
	src/Phormium/Query.php