Use multiples of 4 as indent, shorten overlong lines and fix
other minor things to keep pep8-conformity.

Move the calculations out of the `pre_check()` function.
Also do smarter checks:
  - If len(sequence) == 1, we don't need any rolls. In this case, just
    return sequence[0]
  - If len(sequence) is a factor of dice_sides, we only need one roll
    along with the modulo operator.
  - For everything else, just require one extra roll, bringing it to a
    total of 2 rolls. This should remove a little bit of the edge bias
    introduced by the modulo
Run the `pre_check()` function after the calculations have been done.

For the unit tests:
  - remove the function `test_choice_len_too_short()`;
    we no longer have to raise an exception when the sequence length is
    too short.
  - Write new tests for the cases where `dice_sides = 6` and `len(sequence)`:
     - 1
     - 2,3
     - 4,5

It is passing and doing as expected.

Add an if to the pre_check that catches cases where there are less items
to choose from than sides on the die. If this is the case, we can still
pick items, but we have to use a modulo.
Pick the `num_rolls` so that the result generated after rolling is larger
 than `100*len(sequence)`.
The `pre_check()` function now has to return the modified `num_rolls` as
well as a boolean to indicate whether modulo needs to be applied on the
result.

`pip`, `wheel` and other fundamental helpers dropped or are going
to drop py3.2. It makes no sense to stick with it.

Next release will be a minor release, as a (completely) new default wordlist should not go as a pure bugfix.

Use `.asc` filename extension for signed wordlists.

The original diceware list (with 7776 words) is still shipped with our
package.

renamed wordlist to 'securedrop'

also updated README

Fixes #16

Signed wordlist

Thank you!

"Diceware 8192 list" is not a valid reference any more.

More memorizable wordlist

We have no code-internal bugfixes, but there were erraneous
examples in documentation. We do not want to see that as official
docs in public. The new release should provide updated docs.

This wordlist was renamed to `en`. It is the default wordlist.