Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/golang/geo/s2/doc.go

@@ -0,0 +1,29 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+Package s2 is a library for working with geometry in S² (spherical geometry).
+
+Its related packages, parallel to this one, are s1 (operates on S¹), r1 (operates on ℝ¹),
+r2 (operates on ℝ²) and r3 (operates on ℝ³).
+
+This package provides types and functions for the S2 cell hierarchy and coordinate systems.
+The S2 cell hierarchy is a hierarchical decomposition of the surface of a unit sphere (S²)
+into ``cells''; it is highly efficient, scales from continental size to under 1 cm²
+and preserves spatial locality (nearby cells have close IDs).
+
+More information including an in-depth introduction to S2 can be found on the
+S2 website https://s2geometry.io/
+*/
+package s2