Adds worker to store raw output from PALAVRAS
Adapts portuguese POS tagger to use palavras output previously stored
Allows user to configure the store using a ini style configuration file

This file should live in ~/.pypln_store_config
Merge pull request #156 from flavioamieiro/feature/config_file

Allows user to configure the store using a ini style configuration file
Returns an empty list instead of None if palavras_raw is not available
Updates test to account for the last change
Adds PalavrasRaw to available workers
Merge pull request #157 from flavioamieiro/feature/palavras_full_output

Feature/palavras full output