Fix a boxing warning

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Fix inefficient constructor warning

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Do not use == to compare strings

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Builder: rename Plugin, had the same name as it's superclass

Which is just asking for trouble.

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>