Refactored

Locksmith command-line options have been updated: it now accepts a
dictionary path and a password length. All other options have been
removed.
Locksmith now uses the UNIX dictionary.
The unabr2.txt dictionary has been removed.
The dictionary class has been merged into the password class.
The dictionary class and the dictionary RSpec have been removed.
TODOs have been added to the locksmith module.
The README has been updated.
Merge branch 'alpha'