Adding new documents to mydig

[saggu]

1. When a user uploads a new file, json lines or csv or any format. Catalog the documents in the hbase table <project_name>_catalog as described in Creating a new project #253 .
   Initially the date_processed is empty and status is 0.

2. If the uploaded file is a json lines file, catalog each individual json object, if its a csv or tsv or excel etc, create a wrapping json object and catalog the wrapping json object.

3. Update the table dataset_view as described in Starting up myDIG for the very first time #254 . This table will only updated when documents are either uploaded or deleted from myDIG.