Update app.py

Added wavfile data extraction function to index(); passed the centroids, frequencies and volumes arrays to the index.html file.
Update templates/index.html

Passed arrays from Flask to JavaScript; might do this with File I/O later if speed becomes an issue.
Successfully passed info from Python to JS; focusing on figuring out what the frequency graph looks like now, though.
Looked at graphs to figure out what our frequency distribution looks like.w
We're falling behind schedule. Might want to rethink deadlines.
Wavdata arrays accessible through javascript.
Merge pull request #2 from stuycs-ml7-projects/daryl-basic-visualizer

Stuff Everyone Needs for their visualizers.