Implement rsync like include and exclude - fixes #27

* Implement include/exclude
  * Implement rsync compatible file globbing
  * Implement command line filtering flags
    * --delete-excluded - Delete files on dest excluded from sync
    * --filter - Add a file-filtering rule
    * --filter-from - Read filtering patterns from a file
    * --exclude - Exclude files matching pattern
    * --exclude-from - Read exclude patterns from file
    * --include - Include files matching pattern
    * --include-from - Read include patterns from file
    * --files-from - Read list of source-file nam
    * --min-size - Don't transfer any file smaller than this in k or suffix k|M|G
    * --max-size - Don't transfer any file larger than this in k or suffix k|M|G
  * Document

make_manual.py

@@ -16,6 +16,7 @@ docs = [
     "about.md",
     "install.md",
     "docs.md",
+    "filtering.md",
     "overview.md",
     "drive.md",
     "s3.md",