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/config.go

@@ -160,6 +160,7 @@ type ConfigInfo struct {
 	Timeout        time.Duration // Data channel timeout
 	DumpHeaders    bool
 	DumpBodies     bool
+	Filter         *Filter
 }
 
 // Transport returns an http.RoundTripper with the correct timeouts
@@ -252,6 +253,12 @@ func LoadConfig() {
 		}
 	}
 
+	// Load filters
+	Config.Filter, err = NewFilter()
+	if err != nil {
+		log.Fatalf("Failed to load filters: %v", err)
+	}
+
 	// Start the token bucket limiter
 	startTokenBucket()
 }