switch to go vendoring

vendor/github.com/cubewise-code/go-mime/README.md

@@ -0,0 +1,25 @@
+# go-mime
+Get the mime type / content type of a file from its extension without external dependencies
+
+# Usage
+```
+go get github.com/cubewise-code/go-mime
+```
+
+```go
+import (
+  "github.com/cubewise-code/go-mime"
+)
+
+// Get the file extension
+ext := filepath.Ext(fileName)
+// An empty string is returned if the extension is not found
+contentType := gomime.TypeByExtension(ext)
+
+```
+
+# Why
+We wanted a simple mime library that gives a consistent result on each environment. The golang mime package (https://golang.org/pkg/mime/) loads the list of mime types using the OS, meaning you get a different list depending on OS and OS version. On Windows this depends on the programs installed and whether the user running the process has access to the registry. 
+
+# Mime Source
+The mime list are sourced from here: https://github.com/micnic/mime.json