first sentence

Improve comments in distance.c

note fudge of subsampling threshold

fix erroneous semicolon

remove notes about code modifications (all changes are now cosmetic)

remove dot-product wrapper

remove wrapper around posix_memalign

link to upstream in readme

add levy and goldberg paper to readme

make executable

edit top line of readme

comment TrainModel, clean up TrainModelThread comments

add global var comments, normalize comment style; other minor changes

overhaul comments up to (not including) TrainModelThread

add link to gensim in readme