Warn more about failing bottle version detection.

This is needed for local bottle installation and also possible when
detecting bottle versions from URLs.

Library/Homebrew/cmd/audit.rb

@@ -281,6 +281,9 @@ class FormulaAuditor
         if version_url.to_s == version_text.to_s && s.version.instance_of?(Version)
           problem "#{spec} version #{version_text} is redundant with version scanned from URL"
         end
+        if bottle_filename_formula_name(bottle_filename(f)).empty?
+          problem "Add a new version regex to version.rb to parse the bottle filename."
+        end
       end
 
       if s.version.to_s =~ /^v/

Library/Homebrew/cmd/bottle.rb

@@ -51,6 +51,11 @@ module Homebrew extend self
 
     bottle_revision = bottle_new_revision f
     filename = bottle_filename f, bottle_revision
+
+    if bottle_filename_formula_name(filename).empty?
+      return ofail "Add a new version regex to version.rb to parse the bottle filename."
+    end
+
     bottle_path = Pathname.pwd/filename
     sha1 = nil