Create the home screen and associated functionality

[liammulh]

Based on the wireframes, I need:

• Dynamic welcome message.
• Dynamic current affiliation message.
• Dynamic affiliation in "your curations" table.
• Dynamic affiliation in "all curations" table.
• "Add Curation" button goes to the "new curation" page.
• "Add Disease" button goes to the "new disease" page.
• "Add Allele/Haplotype" button goes to the "new allele/haplotype" page.
• "Add Publication" button goes to the "new publication" page.
• Display user's curations info
• Display all curations info

The last two checkboxes above require me to do the following:

• Create models based on the data model.
• Figure out if any of the fields are choices.
• Add __str__ methods for the models.
• Add the models to the admin interface.
• Create a curator object for my user.
• Create dummy curations for my curator in the admin panel.
• Create test users.
• Create curations linked to the test users.
• Make all views use curator info rather than user info in their context.