(refs #105)Specify suitable Content-Type header for downloaded file.

src/main/scala/app/RepositoryViewerController.scala

@@ -93,8 +93,17 @@ trait RepositoryViewerControllerBase extends ControllerBase {
 
       if(raw){
         // Download
-        contentType = "application/octet-stream"
-        JGitUtil.getContent(git, objectId, false).get
+        val mimeType = FileUtil.getMimeType(path)
+        val bytes = JGitUtil.getContent(git, objectId, false).get
+
+        contentType = if(mimeType == "application/octet-stream" && FileUtil.isText(bytes)){
+          "text/plain"
+        } else {
+          mimeType
+        }
+        //response.setHeader("Content-Disposition", s"inline; filename=${FileUtil.getFileName(path)}")
+        bytes
+
       } else {
         // Viewer
         val large  = FileUtil.isLarge(git.getRepository.getObjectDatabase.open(objectId).getSize)