OSX - mkdir problem, closes #2

- The `implode` Makefile pseudo-target now removes leftovers from tests.
- The non-existent `rebase` Makefile pseudo-target has been removed from
  the `.PHONY` Makefile pseudo-target prerequisites.

preserves the characters outside ASCII.

`\def\thesis@locale{...}`, which also switches hyphenation patterns. The
macro definitions inside locale files are now global to account for the
fact that it now makes sense to include locale files on-site (and
therefore possibly inside a group) using the `\thesis@selectLocale`.

the version of the package, when it's being typeset.

of `\thesis@czech@declaration` for the Faculty of Arts into
`\thesis@lower{czech@...}`, so that the macro always expands to the
correct output regardless of the current locale.

This is merely a matter of consistency, since the style file of the
Faculty of Arts only uses Czech strings within the Czech locale.