Allow CSV import

[Kile-Asmussen]

To allow for much larger datasets, it would be very nice to be able to handle the 'easy part' of counting words, and let this app handle the 'hard part' of generating the graphics.

[jasondavies]

It's up to the developer to handle the counting of words. This library only deals with placement.

[jasondavies]

Reopening as this may be a useful feature to add to my app.