Sentiment Analysis Tool Doesn't work on Mac

[tnoelcke]

When following the set up septs on Mac the sentiment analysis tool does not run correctly.

Repro Steps

1. Install the Orcas project using pip install -r requirements.txt
2. Run the Orcas analysis tool on the test data

 python sentiment.py -l sampledata/lexicon.xlsx -d sampledata/data.xlsx -f output.csv

Expected Result:
The sentiment Tool runs and produces output as expected.
Actual Result:

10-249-96-112:sentiment engineeringuser$ python sentiment.py -l sampledata/lexicon.xlsx -d sampledata/data.xlsx -f output.csv
Traceback (most recent call last):
  File "sentiment.py", line 4, in <module>
    from spellchecker import SpellChecker
ImportError: No module named spellchecker