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/dsoprea/go-jpeg-image-structure/.travis.yml

@@ -0,0 +1,21 @@
+language: go
+go:
+  - master
+  - stable
+  - "1.14"
+  - "1.13"
+  - "1.12"
+env:
+  - GO111MODULE=on
+install:
+  - go get -t ./...
+script:
+# v1
+  - go test -v .
+# v2
+  - cd v2
+  - go test -v ./... -coverprofile=coverage.txt -covermode=atomic
+  - cd ..
+after_success:
+  - cd v2
+  - curl -s https://codecov.io/bash | bash