Miscellaneous updates:
- Updated vendor libraries and related project files.
- Added support for sentiment annotation.
- Added support for parsing plain text documents.
- The Article date attribute is now a Date object instead of a String.
- Added a TaskRunner class which decouples task creation and handling from the TaskServer implementation.
- Added basic TaskRunner implementations for parsing files from a local disk and exporting to standard output, a MongoDB collection, or a Solr index.