Added archiving script

The logos are available for everyone on École polytechnique's site.

In TEXMFMAIN/tex/latex/polytechnique no more subdirectory resources that was ignored during LaTex compilation. Added source files in TEXMFMAIN/source/latex/polytechnique.

Rewriting the package into a Documented LaTeX file .dtx. Added custom installer for windows that compiles the .dtx file with LaTeX and export the resulting files into the right directory of the TeX tree.