Use rubyworks/xdg gem for repofile.
Move things from ffmerge to repository.
Change behaviour of log.

Log now displays the unmerged commits on all remote tracking branches.
Merge branch 'feature/ffmerge-log-refactoring' into develop
Bump version to 0.2.0
Merge branch 'release/0.2.0' into develop
Remove date.
Move arity checks to Command.
Add clone command.
Add: Refuse to overwrite named repository path.
Clone: add param must be an array.
Bump version to 0.2.1
Merge branch 'release/0.2.1' into develop
Command: Refactor method stubs a bit.
Add Output module and TableOutputter.
Bump version to 0.2.2
Merge branch 'release/0.2.2' into develop
Output: Fix missing parameters.
Bump version to 0.2.3
Merge branch 'release/0.2.3' into develop