Don't load wordlist in memory

[ostrolucky]

I reviewed the code and in my opinion one potentially big issue is just using file_get_contents to load the file. This loads whole file in memory. In my opinion library should just count number of lines in file, then generate couple numbers representing lines and read just those through seeking the file.

[adriangonzales]

Thats a great observation. I'll check it out or I'd accept a PR.