Changed heading and byline text of the front page. Fixes issue #16
Banner images behind institutions in list
Attempt at fixing issue #17
Merge pull request #15 from sbearcsiro/institutions

Link to institution from dropdown.
Fixes issue #18 - global news item can now take 1024 chars. Might need to alter database schema on existing databases though.
Resolves issue #20 on browsers that support the window.history api
Resolves issue #20 on browsers that support the window.history api
Validation progress on expedition and instition lists
Email notification when new users are registered
Site_admin role
Add institution stats