添加与时间相关的魔法变量描述。
异步处理 => 持久化处理。
追加纯Javascript SDK实现，添加对应描述。
Merge pull request #26 from BluntBlade/master

异步处理 => 持久化处理。
del upcase
Merge pull request #28 from icattlecoder/feature/delupcase

del upcase
fix jkl tools
Merge pull request #29 from icattlecoder/feature/delupcase

fix jkl tools
edit css of homepage
Merge pull request #30 from SunLn/update_homepage_css

edit css of homepage
Typo fixes in concepts section.
Merge pull request #32 from hughlv/master

Typo fixes in concepts section.
Fixed incorrect response format issue.
Misspelling of action.
Merge pull request #33 from hughlv/master

Fixed format of simple response.
Fixed inconsistent naming of persistent-op.
Merge pull request #34 from hughlv/master

Fixed inconsistent naming of persistent-op.
Merge remote-tracking branch 'qiniu/master' into add_feedback_btn
update makefile
change to test env