Takes too long to parse medium-sized files

[ankush981]

Related issue: #22

On a 28 MB file containing ~27,000 rows, the tool took two minutes and then broke. Even if it didn't break, such response times are unacceptable.

I was thinking that maybe we can add a page-by-page scroll functionality as offered by standard Unix file utilities.

[herrfugbaum]

I'm locking this in favor of #25 and #15