Add a note at the bottom of the site that it is open source
Merge pull request #23 from asmeurer/irc

Link the IRC channel using irc:// syntax
Merge pull request #19 from asmeurer/opensource
Polish the "fork it at github" link

This puts it into the copyright line at the bottom
Update generated files
Add 404 page

This will be shown by github instead of the confusing "github pages developer
information".
Add news for SymPy 0.7.0 release
Add SymPy 0.7.1 to the news
updated one broken link
updated three broken links
updated three broken links
updated one broken link
Merge pull request #25 from Navgeet/master

updating broken links on the support and development page
Add some more versions of the logo
Add a link to the Online Shell
Update generated pages
Add trans tags into the navigation
Install the gettext callables
Update README
Add babel.cfg and extract_i18n_text