Bug fixes and support for optional inputs to xquery module

1. Fixed XDMP-MODNOTFOUND error xquery module is specified as relative path.
2. Added support for an optional init task which will called before uris module.
3. Added support for custom inputs to xquery modules.
4. Closing IO streams properly and added some null checks.

Enhancements to Corb

1. Options as properties file or java system/vm properties.
2. Pre and post batch hooks, which can be configured as xquery modules and/or java tasks.
3. Custom java tasks. Properties can be passed to or between the tasks.
4. Export data to local file system. Useful for running extracts
5. Backwards compatible with https://github.com/marklogic/corb

Added support for a temporary in process exention for batch export file

Added an optional property EXPORT-FILE-PART-EXT - if specified, PreBatchUpdateFileTask adds this extension to export file. It is expected that PostBatchUpdateFileTask will be specified, which removes the extension for the final export file.

v2.0-beta.2: Added pre-batch hook

1. Added support pre-batch hooks
2. Support options file (properties) with a name other than corb.properties via -DOPTIONS-FILE

v2.0-beta: enhanced corb to support post process hooks custom tasks and properties

Added following features

1. Options as corb.properties (in class path)
2. Post batch hooks
3. Custom java tasks
4. Export data to local file system with an option to export all data to a single file using built-in tasks.
5. Backwards compatible