Release 0.6.5:

Updated the models\RedditEngagement.ipynb notebook:
- Removed dependencies on gfile
- Added a mode `current_run_in_colab=True` for running the notebook in Colab or Kaggle
- Made more resillient to missing packages in the public execution environments like Colab and Kaggle
- Added a mode `current_read_from_bq=True` where users can decide whether to get their training data from BigQuery or from snapshot files
- Uploaded snapshot files to models\data so that users without BigQuery access can still run the model
- Made the notebook available on Kaggle https://www.kaggle.com/datancoffee/predicting-community-engagement-on-reddit/