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

fs/operations.go

@@ -438,13 +438,20 @@ func syncCopyMove(fdst, fsrc Fs, Delete bool, DoMove bool) error {
 	go func() {
 		for src := range fsrc.List() {
 			remote := src.Remote()
-			dst, found := delFiles[remote]
-			if found {
-				delete(delFiles, remote)
-				toBeChecked <- ObjectPair{src, dst}
+			dst, dstFound := delFiles[remote]
+			if !Config.Filter.Include(remote, src.Size()) {
+				Debug(src, "Excluding from sync")
+				if dstFound && !Config.Filter.DeleteExcluded {
+					delete(delFiles, remote)
+				}
 			} else {
-				// No need to check since doesn't exist
-				toBeUploaded <- ObjectPair{src, nil}
+				if dstFound {
+					delete(delFiles, remote)
+					toBeChecked <- ObjectPair{src, dst}
+				} else {
+					// No need to check since doesn't exist
+					toBeUploaded <- ObjectPair{src, nil}
+				}
 			}
 		}
 		close(toBeChecked)