Add test with example related to averaging many rasters.

Example code from discussion about ways to average many rasters added to a test.
Change feature traits into classes.

This checkin converts all of the feature traits (e.g. Point, Line, etc.)
into classes.  Geometry is now a class instead of a type alias for
Feature[G,D].  This should greatly simplify error messages.
Allow the admin site to be served from inside the JAR.
Merge pull request #433 from joshmarcus/topic/add_multiraster_test

Add test with example related to averaging many rasters.
Fixed javascript map resize

- Also removed file that was meant to be removed.
Merge pull request #436 from lossyrob/admin/fromjar

Allow the admin site to be served from inside the JAR.
Merge pull request #435 from joshmarcus/topic/feature_classes

Change feature traits into classes.