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-utility/LICENSE

@@ -0,0 +1,7 @@
+Copyright 2019 Random Ingenuity InformationWorks
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/dsoprea/go-utility/image/README.md

@@ -0,0 +1,9 @@
+[![GoDoc](https://godoc.org/github.com/dsoprea/go-utility/image?status.svg)](https://godoc.org/github.com/dsoprea/go-utility/image)
+[![Build Status](https://travis-ci.org/dsoprea/go-utility.svg?branch=master)](https://travis-ci.org/dsoprea/go-utility)
+[![Coverage Status](https://coveralls.io/repos/github/dsoprea/go-utility/badge.svg?branch=master)](https://coveralls.io/github/dsoprea/go-utility?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/dsoprea/go-utility)](https://goreportcard.com/report/github.com/dsoprea/go-utility)
+
+# media_parser_type
+
+Common image-parsing interfaces. Used for JPEG, PNG, and HEIC parsers used by
+go-exif-knife.

vendor/github.com/dsoprea/go-utility/image/media_parser_type.go

@@ -0,0 +1,34 @@
+package riimage
+
+import (
+	"io"
+
+	"github.com/dsoprea/go-exif/v2"
+)
+
+// MediaContext is an accessor that knows how to extract specific metadata from
+// the media.
+type MediaContext interface {
+	// Exif returns the EXIF's root IFD.
+	Exif() (rootIfd *exif.Ifd, data []byte, err error)
+}
+
+// MediaParser prescribes a specific structure for the parser types that are
+// imported from other projects. We don't use it directly, but we use this to
+// impose structure.
+type MediaParser interface {
+	// Parse parses a stream using an `io.ReadSeeker`. `mc` should *actually* be
+	// a `ExifContext`.
+	Parse(r io.ReadSeeker, size int) (mc MediaContext, err error)
+
+	// ParseFile parses a stream using a file. `mc` should *actually* be a
+	// `ExifContext`.
+	ParseFile(filepath string) (mc MediaContext, err error)
+
+	// ParseBytes parses a stream direct from bytes. `mc` should *actually* be
+	// a `ExifContext`.
+	ParseBytes(data []byte) (mc MediaContext, err error)
+
+	// Parses the data to determine if it's a compatible format.
+	LooksLikeFormat(data []byte) bool
+}