bottles: use dedicated version class.

Library/Homebrew/bottle_version.rb

@@ -0,0 +1,8 @@
+class BottleVersion < Version
+  def self._parse spec
+    spec = Pathname.new(spec) unless spec.is_a? Pathname
+    stem = spec.stem
+
+    super
+  end
+end

Library/Homebrew/bottles.rb

@@ -1,6 +1,7 @@
 require 'tab'
 require 'macos'
 require 'extend/ARGV'
+require 'bottle_version'
 
 # TODO: use options={} for some arguments.
 
@@ -91,8 +92,8 @@ def bottle_tag
 end
 
 def bottle_filename_formula_name filename
-  version = Version.parse(filename).to_s
   path = Pathname.new filename
+  version = BottleVersion.parse(path).to_s
   basename = path.basename.to_s
   basename.rpartition("-#{version}").first
 end

Library/Homebrew/test/test_bottle_versions.rb

@@ -0,0 +1,8 @@
+require 'testing_env'
+require 'bottle_version'
+
+class BottleVersionParsingTests < Test::Unit::TestCase
+  def assert_version_detected expected, path
+    assert_equal expected, BottleVersion.parse(path).to_s
+  end
+end