loadlist() will now return a dictionary of the word list when
successfully loaded and None on failure. The unnecessary main
script was removed and core.py took it's place. Wording was
further changed from "password" to "passphrase."
Properly includes the wordlist in the distribution. Adds functions to
load the list of words and return random ones based off the number
generator. The diceware module was restructured and an inefficiency in
numgen() was corrected.
The number generator disproportionately favors digits 1-5 over 6. This
fixes it using random's randint() function and the SystemRandom class.
Function numgen() will now always return a list.
