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-exif/v2/ifd.go

@@ -0,0 +1,34 @@
+package exif
+
+import (
+	"github.com/dsoprea/go-logging"
+
+	"github.com/dsoprea/go-exif/v2/common"
+)
+
+// TODO(dustin): This file now exists for backwards-compatibility only.
+
+// NewIfdMapping returns a new IfdMapping struct.
+func NewIfdMapping() (ifdMapping *exifcommon.IfdMapping) {
+	return exifcommon.NewIfdMapping()
+}
+
+// NewIfdMappingWithStandard retruns a new IfdMapping struct preloaded with the
+// standard IFDs.
+func NewIfdMappingWithStandard() (ifdMapping *exifcommon.IfdMapping) {
+	return exifcommon.NewIfdMappingWithStandard()
+}
+
+// LoadStandardIfds loads the standard IFDs into the mapping.
+func LoadStandardIfds(im *exifcommon.IfdMapping) (err error) {
+	defer func() {
+		if state := recover(); state != nil {
+			err = log.Wrap(state.(error))
+		}
+	}()
+
+	err = exifcommon.LoadStandardIfds(im)
+	log.PanicIf(err)
+
+	return nil
+}