testing the effects of ignoring tiny comments

implemented a minimum length for reddit comments to be parsed and added
to the chain, based on the hypothesis that very short comments have
little valuable content and skew the chain
removed seperate_sentences()...

...in favor of doing the tiny routine that takes in the one place that
seperate_sentences() was actually called
renamed get to make

changed the names of get_hashtag() and get_tweet() to make_hashtag() and
make_tweet() to better describe what the function is actually doing