Update tests to use TravisCI

This will remove the current .drone.yml which isn't used anymore, update the
Makefile target and move tests to using `t.Skip` instead of `t.Fatal` if no
database exists during tests. This is so it's possible to develop new tests
that may not require a database.

Makefile

@@ -6,8 +6,8 @@ build:
 get-deps:
 	@go get -d -v ./...
 
-test:
-	@go test ./...
+test: get-deps
+	@go test -v ./...
 
 format:
 	@go fmt ./...