Fixes #62 - Added is_keyholder to entities

Updated Member pages to include new field.
Updated tests.
Merge pull request #77 from jamiereid/add-key-to-members

Fixes #62 - Added is_keyholder to entities
Members can now renew their membership and update their details (fixes #49)
Tests for member renewal/edit
Merge pull request #78 from cmrn/renew

Members can now renew their membership and update their details
Better (deployable) index page
Merge pull request #79 from cmrn/index-placeholder

Better (deployable) index page