Dont show property table or categories when they have no data.
Dont allow modifications of the uncategorized property category.

Also do not allow the user to submit blank category names
Merge pull request #9 from freerunningtech/uneditable_uncategorized

Dont allow modifications of the uncategorized property category.
Merge pull request #8 from freerunningtech/frontendfix

Dont show property table or categories when they have no data.
Add a select box to the view for measurements.
Grab the measurement unit from the controller.

Display it in the backend.
Allow the setting of the measurement unit.

Ensure that if a measurement unit is present, that the value is numeric
as we'll need to perform mathematical functions on it in the future.
Use lowercase measurement unit names.
Display values according to their measurements.