clean compliated codes, refactor if sections in app.go

Added MaxMemory limit to CopyBody() Supersedes #1484

Beego only uses the MaxMemory flag when using go's built in functions
for parsing forms. However the CopyBody() function have no limit an will
coppy anny amount of data into memory using ioutil.ReedAll() on the
request body whitout anny size validation or limit.

This fix wrapps input.Requst.Body in a LimitedReader using the same
memory limit as ParseFormOrMulitForm()

Revert "compress method fixed"

compress method fixed

in http,the deflate is zlib compress method accoding to the sec
http://tools.ietf.org/html/rfc2616#section-3.5
The "zlib" format defined in RFC 1950 [31] in combination with
        the "deflate" compression mechanism described in RFC 1951 [29].

	windows下静态文件映射找不到问题以及 grace init延后

windows下路径需要filepath.ToSlash

This reverts commit 2c8cb569.

fix the  accept encoding  

Revert "Update orm_querym2m.go"

Update orm_querym2m.go

Log config parsing errors

实际上如果没有使用graceful启动,这些init的工作完全没用
当然其他模块也应该存在这样的工作,比如session中的sess_utils.go中的init工作

Beego currently handles the case of "conf/app.conf"
not existing, but all other errors are not logged.
This fixes that.

I ran into an issue where beego was not listening on the
correct port, and it turned out that the conf/app.conf file
had a colon ":" instead of an equal sign "=" (confusion of
INI vs YAML formats).  When there was a parsing error, beego
would give up on parsing app.conf and not log anything to the
console.

path.Clean和filepath.Clean是有区别的

This reverts commit 50132df8.

context/output.go 简化一下代码,更清晰

fix issue 1438 opened by Ayelet Regev

# Conflicts:
#	memzipfile.go

controller_test.go 既然叫test，那就按照go的规则进行test吧