Removed dimensions from the query string

Previously, you could query for equality on a dimension. For example,
you could query for records with a year of 2010 with year=2010 in the
query string. This has been removed, as it was not used and added a lot
of complexity around casting values.
Remove stencil from dev/user.clj
Merge pull request #136 from cndreisbach/remove-dimension-query

Removed dimensions from the query string