Updates Wiki link in header

Now that we are using GitHub for the wiki, we should link there,
not to Redmine.

Closes https://github.com/aeolusproject/aeolusproject.github.com/issues/61
Merge pull request #75 from n1zyy/issue61_wiki-header

Updates Wiki link in header
Footer cleanup

Closes https://github.com/aeolusproject/aeolusproject.github.com/pull/72
Merge pull request #78 from n1zyy/new_footer

Footer cleanup