Revert "Add pry-byebug for debugging"

This reverts commit 3fc2437b2684bc2aa970773f3edc7b877e47868c.

Since pry-byebug is only compatible with Ruby 2, the checks on Travis
for Ruby 1.9.3 break because it can't run `bundle install` properly.

Since I only used pry-byebug for figuring out one small thing and
haven't needed it before, I'll remove it for the time being.
If I'll need it again, I'll figure out a better solution.
Add acceptance test for typeable passwords

Includes a matcher which checks whether parts of the generated passwords
com from a given list of words.
Make acceptance test use dictionary

Also print more helpful error message if the executable prints an error.
Add unfinished TypeableAlgorithm

Test suite is far from complete.
Put feature spec in pending block

I'll wait until the TypeableAlgorithm is ina decent state before putting
this test online.
Don't use deprecated RSpec pending block syntax
Write algorithm test for different layouts