rename some function name under /utils

change the function name to common english word

add some func to beego/utils

Update README.md

initial utils dir

Adding template functions to generate JS and CSS tags

Adding assets_js, assets_css template functions

Adding Assets functions for the template, to generate HTML tags for JS and CSS

Improve unhandled error handling in prod mode

This reverts commit c2079276.

Improve unhandled error handling in prod mode

miswrite a type of word

Fixed some typos

beeapi example is broken