#63 Support Adobe Flex convention for resource bundles

[Deyan none]

Adobe Flex uses properties files for keeping localized values. The only difference between java and flex resource bundles is the structure.

In Java the locale is stored in the file name:
Messages_en_US.properties
and all files are in the same folder.

In Flex the structure is like this:

project/locales/en_US/Messages.properties
project/locales/fr/Messages.properties

It would be really convenient to add support for flex rbs.