add some descriptions
fix
Update image-process.markdown
remove describe of callback accesstoken
Merge pull request #37 from longshanksmo/fix/rm_callback_auth

remove describe of callback accesstoken
Merge pull request #36 from SunRunAway/patch-1

Update image-process.markdown
description modify
Merge pull request #35 from coaku/feature/b_xzk_improve_file_handle

Feature/b xzk improve file handle
Merge remote-tracking branch 'qiniu/develop' into fix_apidocName