Pruning done for decision trees.
Merge branch 'master' of https://github.com/mike-n-7/COMP598Project2
Added lsi dataset with 100 topics.

wrote feature extraction

added dir check & creation

now dumps pickle file instead of csv

Added cross validation work.

Added raw abstracts.

Added cross validation changes.

Removed large files.

Deleted lsi_train
Added more files.
Merge branch 'master' of https://github.com/mike-n-7/COMP598Project2