improve import process
don't install tests
debug boxplot, unstack for multi-dataset support
option to boxplot by month
update copyright year
add chart module to readme
update link
geojson improvements

 - re-enable pagination
 - dont set SRID for simple lat/lon data
 - same fields as normal list serializer, plus locations
include serialized parent object in filtered list context
allow for dict as data in from_native
better error messages for multi-column metadata
better time handling
Merge pull request #17 from wq/dbio

improvements to dbio, chart, and geojson support
v0.5.0
update version
make EventResult.result_value behave like Result.value
allow Report.entered to be overridden
allow blank (but not null) to make form submission work
allow empty string in nested key
use fewer queries when updating a large number of EventResults