Fix comment
[REFACTORING]Return fast
[REFACTORING]Stop to use #find_existing_file_with_extension
Remove #find_existing_file_with_extension
[REFACTORING]Decomposite functions
Make app respond with Last-Modified header
Convert Last-Modified HTTP date format
Add a test for Last-Modified header
Merge branch 'master' of github.com:KitaitiMakoto/rack-zip

Conflicts:
	lib/rack/zip.rb