Pass the argument for the command when calling #check_special_labels

We should catch the argument ourselves here and pass it to the label
checking algorithm, to be sure this stuff works as expected.
Added debug output
Fix: (closes #95) Generation of path-regex was buggy

The path regex was not created properly, we created something like

    2014-01-today

which is rubbish, we should have created

    2014-01-#{Date.today.day.to_s.rjust(2, "0")

This was fixed by this commit (Some refactoring for smaller methods
included).
Merge pull request #98 from matthiasbeyer/fix-limit-day-command

Fix: (closes #95) Generation of path-regex was buggy