update some tips
fix #350
add default mime type to fix #341
change syscall package to os.Kill
default app HttpAddr should none
initial utils dir
Merge pull request #353 from shxsun/master

initial utils dir
add other utils
update config to change section . to ::
for init if doesn't have app.conf will not panic
update file cache
beego config module json support get data like key::key::key
update httplib support https
Update README.md
Merge pull request #359 from wangkechun/patch-1

Update README.md
add some useful func
Merge pull request #360 from shxsun/master

add some func to beego/utils
set cookie to zero
update httplib to support setcookie
rename some function name under /utils

change the function name to common english word