jeo/jeo — pull request #70 by ischneider (2014-05-22 18:55:44+00:00)
Title: uniform filter behavior on missing property

for math expressions, a missing property is a NaN
for filters, a missing property evaluates to false

- fix behavior in CQL filter including NaN handling in
Comparison
- have sql drivers fall-back to CQL filtering on missing
properties to avoid SQL errors
- test coverage