Add fluid transaction check. Closes #922.

Author: gabordemooij

Diff for: RedBeanPHP/Facade.php

@@ -381,6 +381,7 @@ public static function useISNULLConditions( $mode )
 	 */
 	public static function transaction( $callback )
 	{
+		if ( !self::$allowFluidTransactions && !self::$redbean->isFrozen() ) return FALSE;
 		return Transaction::transaction( self::$adapter, $callback );
 	}
 

Diff for: testing/RedUNIT/Blackhole/Misc.php

@@ -396,13 +396,14 @@ public function testTransactionInFacade()
 			pass();
 		}
 		asrt( R::count( 'bean' ), 1 );
-		R::freeze( FALSE );
 		try {
 			R::transaction( 'nope' );
 			fail();
 		} catch (\Exception $e ) {
 			pass();
 		}
+		R::freeze( FALSE );
+		asrt(R::transaction( 'nope' ), FALSE);
 		testpack( 'Test Camelcase 2 underscore' );
 		$names = array(
 			'oneACLRoute'              => 'one_acl_route',