Created a simple FileTypeExtractor that reports the file extension.
Changed file extensions to lowercase.
Merge branch 'feature/basic-commons-support' into feature/filetypeextractor
Updated FileTypeExtractor to use its own destination ("file_information") and its own property ("fileExtension").
Merge branch 'master' into feature/filetypeextractor
Added a check for redirects in FileTypeExtractor.
Added a logging.warning for long extensions (>4 characters).
Merge branch 'commons' into feature/filetypeextractor
Merge branch 'commons' into feature/filetypeextractor
Updated the ontology.
Modified the FileTypeExtractor to emit dct:type and dct:format.
Merge branch 'commons' into feature/filetypeextractor
Merge pull request #13 from gaurav/feature/extractionSamples-namespaces

Namespaces for extractionSamples
Merge branch 'commons' of github.com:gaurav/extraction-framework into commons
make ConstantMapping work with custom URIs
Needed to provide licence information in commons as in gaurav/extraction-framework#7
fix XMLSource issue in mappings wiki.
Mappings wiki MW is very old and does not include the <ns> element in it's schema.
Issue reported by [1] and was caused by #233 (from @nilesh-c)

[1] http://www.mail-archive.com/dbpedia-discussion@lists.sourceforge.net/msg06248.html
Merge branch 'master' into commons
Merge branch 'master' into feature/filetypeextractor
Updated FileTypeExtractor to use the dc:types in the DBpedia ontology.
Updated FileTypeExtractor to emit dc:type and rdf:type.