added functionality for column type time

fix the issue #1850,the source of the problem is PR #1805

updated the model_fields to cater for the time field type

make template execution be expected

Support get environment variables in config

Implemented possibility to add custom template engines

To support `go run`

delete not used variable (status int) in output.go functions

Beelog bug fix

key format : ${ENV_PART||defaultValue} or  ${ENV_PART}

add function of beego/logs

file rotate bug

orm: support insert a specified value to auto field

in `session` package, add some helpful tools to help subpackage logging information