Removed deprecated exceptions, fixed #90

Doctrine/Exception/Find.class.php

-<?php
-Doctrine::autoload("Doctrine_Exception");
-/**
- * thrown when user tries to find a Doctrine_Record for given primary key and that object is not found
- */
-class Doctrine_Find_Exception extends Doctrine_Exception { 
-    public function __construct() {
-        parent::__construct("Couldn't find Data Access Object.",Doctrine::ERR_FIND);
-    }
-}
-

Doctrine/Exception/Mapping.class.php

-<?php
-Doctrine::autoload("Doctrine_Exception");
-/**
- * thrown when user tries to get a foreign key object but the mapping is not done right
- */
-class Doctrine_Mapping_Exception extends Doctrine_Exception { 
-    public function __construct($message = "An error occured in the mapping logic.") {
-        parent::__construct($message,Doctrine::ERR_MAPPING);
-    }
-}
-

Doctrine/Exception/Naming.class.php

-<?php
-Doctrine::autoload('Doctrine_Exception');
-/**
- * thrown when user defined Doctrine_Table is badly named
- */
-class Doctrine_Naming_Exception extends Doctrine_Exception {
-    public function __construct() {
-        parent::__construct("Badly named Doctrine_Table. Each Doctrine_Table
-                             must be in format [Name]Table.", Doctrine::ERR_NAMING);
-    }
-}
-

Doctrine/Exception/PrimaryKey.class.php

-<?php
-Doctrine::autoload("Doctrine_Exception");
-/**
- * thrown when Doctrine_Record is loaded and there is no primary key field
- */
-class Doctrine_PrimaryKey_Exception extends Doctrine_Exception {
-    public function __construct() {
-        parent::__construct("No primary key column found. Each data set must have primary key column.", Doctrine::ERR_NO_PK);
-    }
-}
-