Update mapnik + node to http/2 compatible versions.

bump version

escape docker vars

update url for telemetry stats. refs #47 for eventual abstraction work

bump ver again to skip 13 release

temp fix for certificate issue

bump ver

bump ver

Beta (#40)

* fix 500 issue certain searches

* increment version number

* use json output for 400 errors with invalid values

* Update package.json

increment version number

* restore unit test to expect json

* increment version number

add more information to status return.