DataFileProvider should provide location of data files to OSGi components.

Currently the DataFileProvider only supports requests for resources. If a specific resource is available the caller gets an InputStream for that Resource. Otherwise a IOException is thrown.

Here the proposal is to add :

DataFileProvider (interface)
URL getInputStream(
            String bundleSymbolicName,
            String filename,
            Map<String,String> comments) throws IOException;

Service that allows to return the location of data files to OSGi components.
eg. stanbol/datafile/path/to/file or jar:file:/home/.m2/repository/jarfile.jar!/path/to/file

Intended Usage:
Jira issue stanbol-1007 uses CMU Sphinx api. Sphinx needs the URL to load the model files. No such api has been provided yet by Sphinx to load the model as Stream.