add blog for 115
add article
add comments
add cached_comments_count
add cached_comments
add cached_find
add cached_published
update README
Merge branch 'master' of https://github.com/bay6/railscasts
solve gem problem
fixed config problem and some depracted apis
update routes
add readme
Merge pull request #33 from xiongbo/master

finished 415 #25
update topic list
updated topic list again
Revert "updated topic list again"

This reverts commit e2fe8d0ea2c93ffe15c951f7574aa2e215fb1925.
Revert "update topic list"

This reverts commit 837da067f6b488025562f22aa8c0508d638f0c62.
updated tech talk topic list
cached counter updated #23