Merge pull request #35 from tschmorleiz/master

More changes towards tours
closes 101companies/101wiki#301
fixes 101companies/101wiki#295
added nice redirect for pages, closes 101companies/101wiki#298
fixes 101companies/101wiki#303
closes 101companies/101wiki#304
cleanup
fixes 101companies/101wiki#305
another fix for 101companies/101wiki#305
closes 101companies/101wiki#306
fixed message in devise
added sitemap generation
split contributions in view
removed no more used method
formatings
seted link to /contribute for landing page
renamed menu item in dropdown menu
more time for flash message
changed template for contribution
changed form for contributing