Version 0.2  (see description)

The changes are:
1. Build creates jar file with a plugin, not war for testing
2. You can change locale manually using session "locale' attribute
3. If session does not contain locale attribute, the plugin always using
the request  locale
4. The plugin searches properties file in the standard i18n order - if
the locale is "he_IL" it will first look for
"messages_he_IL.properties", if it does not exists will search for
"messages_he.properties" and then for "messages.properties"
5. You can set encoding for messages files using config file
6. Groovy version is updated to support the fix in ConfigSlupper