Test both dbs (#205)

* move scripts, allow testing both dbs with one cmd

* tidy + vendor

* update test.sh to ignore cache

* put test commands directly in drone.yml

* change CONTRIBUTING slightly

* go ham on the readme

scripts/test.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -e
+
+# "-count 1" = run all tests once, ignoring cache; useful for when we're running tests with different database back to back like this
+# "-p 1" = run with parallel value of 1 -- in other words, one test at a time
+# "./..." = all tests
+
+# run tests with sqlite in-memory database
+GTS_DB_TYPE="sqlite" GTS_DB_ADDRESS=":memory:" go test -count 1 -p 1 ./...
+
+# run tests with postgres database at either GTS_DB_ADDRESS or default localhost
+GTS_DB_TYPE="postgres" GTS_DB_ADDRESS="${GTS_DB_ADDRESS:-localhost}" go test -count 1 -p 1 ./...