Started work on a GalleryExtractor.
GalleryExtractor can now extract entire lines and create links.
Updated GalleryExtractor to support line numbers and matching filenames (issue #26).
Updated GalleryExtractor to use dbo:hasGalleryItem and updated ontology to include them.
Improved documentation and warnings.
Added GalleryExtractor to the Commons default extractors.
Fixed property in documentation.
Fixed property in documentation, updated destination, cleaned up code.
Merge branch 'feature/galleryextractor' of github.com:gaurav/extraction-framework into feature/galleryextractor
Merge pull request #261 from gaurav/feature/galleryextractor

Gallery Extractor: links galleries to the file used