Add a date selector
Geographic resources in a topo folder
Change data reference

Focus on one variable (HHI) to test change of years.
Select date and variable
Correct NaN bug
Add 30y changes of H Index
d.id as integer

County ids are now integers for all data representations
Fixes a bug for county ids starting with 0.
Structure of the menu module
Create a mapper module
Mapper js module

Create a multidimensional d3.map
Implement the mapper module in index.html
Create a nullMap when there is no data

When the mapper is queried for a variable that doesn’t exist, it
returns a map of null values.
New variables in the json variable descriptor

This json will be used to generate the menu automatically.
Menu module
Implement menu module in index.html

Menu is generated automatically from the data and variables descriptor
json.
Encapsulate d3 listeners in a listeners function

The function is called after the menu has been created.
Update Metro stats by County data
Casting bug in mapper
Merge branch 'menumaker' into date
Merge branch 'date' into gh-pages