finish delete by ip
refactor test for delete by ip
finish delete by tid
delete comments by fid
 Merge branch 'enhance-delete' into 'master'

Enhance Delete
store site info in mem
init logger and add cache define
store hot block data in redis
get block list in desc order
finish store block list in redis
refactor block page cache
fix tests for cached blocks
add cache for get_comments_by_fid
use msgpack pack data
finish add cache for apis
 Merge branch 'cache' into 'master'

Cache

add cache for api
remove code to right position
 Merge branch 'cache' into 'master'

Cache

clear code
update README.md
rename docs