Took height off the navigation (it breaks when there's too many links)
Added support for booleans
Added support for nullables and text attribute
Added float support
Updated text attribute
Merge branch 'master' of git://github.com/mneumegen/upmin-admin-ruby into mneumegen-master
Updating the code for issue #23 since datetime needed a rewrite
Merge pull request #27 from upmin/mneumegen-master

Extending PR #23