Adding 'components' templates

Added new attribute: 'component' (in 'field' or 'display' taglibs).
Now it is possible to specify which component is going to be used (it has to be placed inside _fields/_components/componentName/_field.gsp or _fields/_components/componentName/_display.gsp)

e.g.: <field bean="someBean" property="someProperty" component="time"/> (Is going to use _fields/_components/time/_field.gsp)

This is usefull to render same template multiple times across different properties.