Add additional source code extensions and markdown

Some gears write out pipelines in TOML, YAML, and XML. Markdown has been spotted out there as well...

api/filetypes.json

@@ -14,11 +14,12 @@
     "archive":      [ ".zip", ".tbz2", ".tar.gz", ".tbz", ".tar.bz2", ".tgz", ".tar", ".txz", ".tar.xz" ],
     "document":     [ ".docx", ".doc" ],
     "image":        [ ".jpg", ".tif", ".jpeg", ".gif", ".bmp", ".png", ".tiff" ],
-    "markup":       [ ".html", ".htm" ],
+    "markup":       [ ".html", ".htm", ".xml"  ],
+    "markdown":     [ ".md", ".markdown"  ],
     "log":          [ ".log" ],
     "pdf":          [ ".pdf" ],
     "presentation": [ ".ppt", ".pptx" ],
-    "source code":  [ ".c", ".py", ".cpp", ".js", ".m", ".json", ".java", ".php", ".css" ],
+    "source code":  [ ".c", ".py", ".cpp", ".js", ".m", ".json", ".java", ".php", ".css", ".toml", ".yaml", ".yml" ],
     "spreadsheet":  [ ".xls", ".xlsx" ],
     "tabular data": [ ".csv.gz", ".csv" ],
     "text":         [ ".txt" ],