Support of the option :localized for Plain Literals.

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
:localized option should be used with 'property' since it processes a String

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Update doc

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Merge pull request #7 from PerfectMemory/upmaster

Support for localized properties