Cleanup and verify scripts

[BryanCutler]

Moved all notebooks to scripts/

Fixed directory spelling of human_labels_audited

Replaced Label_Stats with Label_Stats_Fred.ipynb

Ran all scripts and notebooks and fixed any data file locations and made sure script ran

Fixes #18

[review-notebook-app]

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[BryanCutler]

@kmh4321 I get a div by 0 error when I run this notebook, can you check it out and see if you get the same?

[BryanCutler]

@kmh4321 and @xuhdev , do we still need apply_sentence_correction.ipynb, sentence_correction_preprocessing.ipynb and token_correction_preprocessing.ipynb or can we archive them?

[xuhdev]

apply_sentence_correction.ipynb is already in download_and_correct_corpus.py, sentence_correction_preprocessing.ipynb is only supposed to be used to generate the correction files. I'm not sure what token_correction_preprocessing.ipynb is for

[BryanCutler]

Ok I'll archive apply_sentence_correction.ipynb since I'm sure that one has been ported, but leave the other 2