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.
