Fix bug with string pattern matching with "."

Previously, a route like "/:a.png" would match "/foo/bar/baz.png".
This was incorrect, as all matches should be restricted to path segments
(or smaller, as dictated by a break character).

This bug was introduced in 1a390aba1c.

Fixes #75.

web/pattern_test.go

@@ -124,6 +124,7 @@ var patternTests = []struct {
 			pt("/a/cat", false, nil),
 			pt("/a/cat/gif", false, nil),
 			pt("/a/cat.", false, nil),
+			pt("/a/cat/dog.gif", false, nil),
 		}},
 
 	// String prefix tests

web/string_pattern.go

@@ -45,7 +45,7 @@ func (s stringPattern) match(r *http.Request, c *C, dryrun bool) bool {
 		m := 0
 		bc := s.breaks[i]
 		for ; m < len(path); m++ {
-			if path[m] == bc {
+			if path[m] == bc || path[m] == '/' {
 				break
 			}
 		}