Command init: Refactoring and tests.
More tests. Working init command.
Making it possible to initialise empty directories.
Merge branch 'master' of https://github.com/ralsina/nikola into command_init
Updated changelog.
Making use of the --empty parameter when creating the target site.
Tackling #138.
Extended tests.
Merge pull request #255 from okin/command_init

Options for the init command, initialising empty directories